Medical Disclaimer This article is for educational purposes only and does not replace medical advice, diagnosis, or treatment. A baby’s head shape, soft spot, skull ridges, and growth curve should be interpreted by a qualified healthcare professional. Always talk with your child’s pediatrician, craniofacial team, pediatric neurosurgeon, craniofacial plastic surgeon, or healthcare provider about your child’s individual situation.
Most parents do not start by thinking, “My baby may have craniosynostosis.”
They usually start with something much more ordinary:
- “My baby’s head shape looks different.”
- “There is a ridge on the skull.”
- “The soft spot seems small.”
- “The forehead looks pointed.”
- “One eye looks higher than the other.”
- “The back of the head is flat.”
- “The head looks long and narrow.”
- “My baby’s head growth curve changed.”
Then a pediatrician, family member, physical therapist, helmet clinic, or online search brings up the word craniosynostosis.
That can feel terrifying.
Parents often wonder:
- How do I know if this is craniosynostosis?
- Is a ridge always bad?
- Does a small soft spot mean the skull fused too early?
- Is this just flat head syndrome?
- Can craniosynostosis affect the brain?
- How urgent is this?
- When should I ask for a referral?
The short answer is:
The most common first sign of craniosynostosis is an unusual head shape. Other clues can include a hard ridge along a skull suture, facial or eye asymmetry, a soft spot that seems unusual, or head circumference that is not growing as expected. But no single sign proves craniosynostosis by itself. Doctors look at the full pattern: head shape, suture ridges, soft spots, facial features, head growth, development, and sometimes imaging.
The CDC states that the first sign of craniosynostosis is usually an abnormally shaped skull. Healthcare providers may feel for hard edges along the sutures, check for unusual soft spots, look for no soft spot, assess slow or absent head-size growth over time, and examine facial shape. (cdc.gov)
This guide explains the signs parents often notice first — and how to think about them without panicking.
Quick Answer: What Are the Early Signs of Craniosynostosis?
The early signs of craniosynostosis may include:
- An unusual head shape
- A head shape that does not improve after newborn molding
- A head shape that becomes more noticeable over time
- A hard ridge along one of the skull sutures
- A soft spot that seems absent, unusually small, full, or bulging
- Slow growth or no growth in head circumference over time
- A long, narrow head shape
- A triangular forehead
- One-sided forehead or eye asymmetry
- A short, wide, or tall head shape
- Back-of-head flattening with unusual ear position
- Facial asymmetry
- A head shape that does not match a simple positional flat spot
The CDC lists abnormally shaped skull, hard edges along sutures, unusual soft spots, no soft spot, and slow or absent head growth over time as signs clinicians may consider when diagnosing craniosynostosis. (cdc.gov)
The parent-friendly takeaway:
The biggest early clue is usually the pattern of head shape, not one isolated ridge, soft spot, or measurement.
What Craniosynostosis Means
A baby’s skull is made of several bony plates connected by flexible seams called sutures. These sutures allow the skull to expand as the brain grows.
Craniosynostosis means one or more of those sutures closes too early.
When a suture closes too early, the skull cannot grow normally in that area. The brain still grows, so the skull may grow more in other directions. That creates a head-shape pattern that often gives doctors clues about which suture is involved.
The CDC explains that when one suture closes, growth stops in that part of the skull while areas with open sutures continue to grow; if more than one suture closes early, the brain may not have enough room to grow, which can lead to pressure inside the skull. (cdc.gov)
The simple explanation:
Craniosynostosis is a skull-growth problem caused by early closure of a skull suture.
Sign #1: An Unusual Head Shape
The most common sign parents notice first is head shape.
This may include a head that looks:
Long and narrow
Short and wide
Triangular in the forehead
Flat on one side of the forehead
Flat at the back in an unusual pattern
Tall or tower-like
Asymmetric from the front or top
Different from birth and not improving
Worse over time instead of better
Johns Hopkins states that in single-suture craniosynostosis, the most common symptom is an atypical head shape, and different sutures create specific shape changes such as an unusually long head, forehead bulging, or irregularly shaped face and skull. (hopkinsmedicine.org)
This is why doctors look at the head from multiple angles:
- Front
- Side
- Back
- Top
- Three-quarter view
- With the baby sitting upright if possible
- After the hair is wet or flattened if helpful
The practical message:
Head shape is not just cosmetic information. It can tell the doctor which suture may be involved.
Head Shape Patterns Parents May Notice
Different suture problems create different patterns.
Head-shape clue
Possible concern to ask about
Long, narrow head
Sagittal craniosynostosis
Triangular or pointed forehead
Metopic craniosynostosis
Ridge down forehead with normal shape
May be benign metopic ridge
One-sided forehead flattening
Coronal craniosynostosis
One eye looks higher, larger, or different
Coronal craniosynostosis or orbital asymmetry
Short, wide, tall head
Bicoronal craniosynostosis or positional brachycephaly
Flat back of head with forward ear shift
Positional plagiocephaly more likely
Flat back of head with backward or lower ear shift
Lambdoid craniosynostosis should be ruled out
Complex or unusual shape involving several areas
Multisuture or syndromic craniosynostosis should be considered
The CDC describes several suture-specific patterns: sagittal synostosis can cause a long, narrow head; one-sided coronal synostosis can cause forehead flattening, a raised eye socket, and nose deviation; bicoronal synostosis can cause a broad, short head; lambdoid synostosis can flatten the back of the head; and metopic synostosis can create a narrow front and broad back pattern called trigonocephaly. (cdc.gov)
The patient-friendly takeaway:
The shape matters because the shape often points to the suture.
Sign #2: A Long, Narrow Head Shape
A long, narrow head shape may be a sign of sagittal craniosynostosis.
The sagittal suture runs from front to back along the top middle of the skull. When it closes too early, the skull may not widen normally. Instead, the head grows longer from front to back and narrower from side to side.
Parents may notice:
- The head looks long from the side
- The head looks narrow from the front
- The forehead looks prominent
- The back of the head looks prominent or pointed
- There may be a ridge along the top middle of the head
- The head shape does not round out after birth
Johns Hopkins explains that early fusion of the sagittal suture causes the skull to become long from front to back and narrow from ear to ear, a shape called scaphocephaly. (hopkinsmedicine.org)
Important nuance:
A newborn’s head can look long or cone-shaped after birth because of molding. But newborn molding usually improves. A long, narrow shape that persists or becomes more obvious should be checked.
The practical message:
A long, narrow head shape is not the typical pattern for simple flat head syndrome. Ask whether sagittal craniosynostosis should be ruled out.
Sign #3: A Triangular Forehead
A triangular or pointed forehead may be a sign of metopic craniosynostosis.
The metopic suture runs from the top of the nose up the middle of the forehead. When it closes too early in a way that restricts forehead growth, the forehead may become narrow or triangular. This shape is called trigonocephaly.
Parents may notice:
- A pointed forehead
- A triangular forehead from above
- A ridge down the middle of the forehead
- Narrow temples
- Eyes that appear close together
- A teardrop-shaped head from above
Johns Hopkins notes that early closure of the metopic suture may cause a prominent forehead ridge and, in rare cases, a triangular forehead with closely placed eyes. (hopkinsmedicine.org)
Important nuance:
A metopic ridge alone does not always mean metopic craniosynostosis.
Nationwide Children’s states that metopic ridging without the triangular shape is a normal variant and does not require surgical correction. (nationwidechildrens.org)
The practical message:
For metopic concerns, the key question is not only “Is there a ridge?” It is “Is the forehead truly triangular?”
Sign #4: One-Sided Forehead, Eye, or Brow Asymmetry
One-sided forehead flattening, brow difference, or eye-socket asymmetry may be a sign of unicoronal craniosynostosis.
The coronal sutures run from each ear area toward the top/front of the head. If one coronal suture closes early, the forehead and brow on that side may not grow normally.
Parents may notice:
- One side of the forehead looks flat
- The opposite side of the forehead looks fuller
- One eyebrow looks higher or different
- One eye looks taller, larger, higher, or more open
- The nose seems pulled or turned toward one side
- The face looks slightly rotated or asymmetric
Johns Hopkins describes unicoronal craniosynostosis as causing flattening of the forehead and brow on the affected side, bulging of the opposite forehead, a different shape to the eye on the affected side, and sometimes flatness at the back of the head. (hopkinsmedicine.org)
The practical message:
If the concern is one-sided forehead, brow, eye, or nose difference, ask whether coronal craniosynostosis should be evaluated.
Sign #5: A Short, Wide, or Tall Head Shape
A short, wide head shape can have more than one cause.
It may be positional brachycephaly, which happens when the back of the head becomes flattened from pressure while the sutures remain open.
It may also be bicoronal craniosynostosis, which happens when both coronal sutures close too early.
Parents may notice:
- The head looks short from front to back
- The head looks wide from side to side
- The forehead looks flat, tall, or steep
- The back of the head looks flat
- The top of the head looks unusually high
Johns Hopkins describes bicoronal craniosynostosis as causing a skull that is short front-to-back, wide, tall, with a flat forehead and flat back of the head. (hopkinsmedicine.org)
HealthyChildren.org explains that deformational brachycephaly is a positional skull deformity where the head is symmetrically flat in the back and wide from side to side, often in babies who spend a lot of time on their backs. (healthychildren.org)
The practical message:
A short-wide head shape can be positional or synostotic. The forehead, eye sockets, growth curve, and specialist exam help tell the difference.
Sign #6: Back-of-Head Flattening
Back-of-head flattening is very common in babies and is usually positional.
But rarely, it can be caused by lambdoid craniosynostosis, which involves a suture at the back of the skull.
Parents may notice:
- One side of the back of the head is flat
- The whole back of the head is flat
- The ear on the flat side looks shifted
- The head looks slanted from above
- The baby prefers turning the head one direction
- The back hairline looks tilted
- A bulge behind one ear
HealthyChildren.org states that deformational plagiocephaly causes uneven flattening in the back of the head, with the forehead often more prominent and the ear shifted forward on the flat side; this is often seen in babies who prefer sleeping with the head turned to one side or who have torticollis. (healthychildren.org)
Nationwide Children’s notes that lambdoid craniosynostosis is very rare and is the only craniosynostosis type that causes back-of-head flattening similar to positional plagiocephaly. In lambdoid synostosis, the ear and possibly forehead on the flat side may shift backward, creating a trapezoid shape; in positional plagiocephaly, the ear and forehead usually shift forward, creating a parallelogram shape. (nationwidechildrens.org)
The patient-friendly takeaway:
Most back flat spots are positional. But backward or downward ear shift, a trapezoid head shape, mastoid bulging, or worsening asymmetry should prompt craniofacial evaluation.
Sign #7: A Skull Ridge
A ridge along the skull can be one of the first things parents feel.
Parents may feel:
- A ridge along the top middle of the head
- A ridge down the forehead
- A ridge near the side/front of the skull
- A ridge near the back of the skull
- A hard edge where they expected the skull to feel smooth
The CDC states that healthcare providers may identify craniosynostosis by feeling the baby’s head for hard edges along the sutures. (cdc.gov)
But a ridge does not always mean craniosynostosis.
Some ridges may be related to:
- Normal skull anatomy
- Newborn molding
- Overlapping skull plates after birth
- A normal metopic ridge
- Thin scalp tissue
- A suture that is easy to feel but not pathologically fused
The practical message:
A ridge should be checked, especially if it appears with abnormal head shape. But a ridge alone is not enough to diagnose craniosynostosis.
Ridge Clues by Location
- The location of the ridge may help guide the question.
- Ridge location
- What to ask about
- Top middle of head, front to back
- Could this be sagittal craniosynostosis?
- Down middle of forehead
- Is this a normal metopic ridge or metopic craniosynostosis?
- Side/front of head near forehead
- Could this be coronal craniosynostosis?
- Back of head
- Could this be lambdoid craniosynostosis?
- More than one ridge
- Could more than one suture be involved?
- The key is whether the ridge matches a head-shape pattern.
For example:
- A top ridge plus long, narrow head shape is more concerning for sagittal craniosynostosis.
- A forehead ridge plus triangular forehead is more concerning for metopic craniosynostosis.
- A forehead ridge without triangular shape may be a normal metopic ridge.
A back ridge plus trapezoid head shape and backward ear shift is more concerning for lambdoid craniosynostosis.
The practical takeaway:
The ridge matters most when it comes with the matching head-shape change.
Sign #8: Soft Spot Changes
The soft spot, or fontanelle, can cause a lot of anxiety.
Parents may worry if:
- The soft spot seems small
- The soft spot seems closed
- The soft spot is hard to find
- The soft spot looks full
- The soft spot looks bulging
- The soft spot looks sunken
- The soft spot pulses
- The soft spot seems different than another baby’s
The CDC lists no soft spot and unusual soft spots as signs healthcare providers may consider in craniosynostosis evaluation. (cdc.gov)
But soft spot findings must be interpreted carefully.
Cleveland Clinic explains that some babies have a less noticeable, “quiet” fontanelle, and if the child’s head is growing normally, a less obvious soft spot may not be concerning. Cleveland Clinic also notes that a bulging fontanelle or sunken fontanelle can sometimes signal other health concerns, such as pressure, infection, trauma, or dehydration, especially when other symptoms are present. (clevelandclinic.org)
The parent-friendly takeaway:
A soft spot concern should be interpreted with head shape, head growth, hydration, illness symptoms, and the baby’s overall behavior.
Does a Closed Soft Spot Mean Craniosynostosis?
Not necessarily.
This is one of the most common parent misunderstandings.
A soft spot that seems small, hard to feel, or closed does not automatically mean the skull sutures are fused too early. Doctors care about the whole picture:
- Is head circumference growing normally?
- Is head shape normal?
- Are there ridges?
- Is the baby developing as expected?
- Is the baby otherwise well?
Cleveland Clinic notes that if a baby’s soft spot is less noticeable but the head is growing normally, there may not be much to worry about; if the healthcare provider is concerned that the soft spot closed too soon, imaging may be suggested. (clevelandclinic.org)
The practical message:
A closed or hard-to-feel soft spot is not a diagnosis. It is a reason to ask whether head growth and head shape are normal.
When a Bulging Soft Spot Is More Concerning
A soft spot may look temporarily fuller when a baby cries, lies down, strains, or vomits. But a persistently bulging or tense soft spot can be concerning, especially if the baby is ill or acting differently.
Call your child’s healthcare professional promptly if a bulging soft spot occurs with:
Fever
Repeated vomiting
Unusual sleepiness
Poor feeding
Irritability
A high-pitched cry
Seizure-like activity
Recent head injury
Developmental regression
Cleveland Clinic advises contacting a healthcare provider for a swollen or bulging soft spot, especially after head injury or when paired with symptoms such as vomiting, fatigue, extra sleepiness, fussiness, or behavior changes. (clevelandclinic.org)
Johns Hopkins lists a full or bulging fontanelle among possible signs of elevated intracranial pressure in craniosynostosis. (hopkinsmedicine.org)
The practical message:
A persistently bulging soft spot plus illness symptoms or behavior changes should be taken seriously.
When a Sunken Soft Spot Is More Concerning
A sunken soft spot is usually not a craniosynostosis-specific sign. It can be a sign of dehydration, especially if the baby is not feeding well or has fewer wet diapers.
Other dehydration clues may include:
- Dry mouth or lips
- Fewer wet diapers
- No tears when crying
- Extra sleepiness
- Fussiness
- Poor feeding
- Vomiting or diarrhea
Cleveland Clinic states that a sunken fontanelle is often a sign of dehydration and recommends contacting the child’s healthcare provider if the sunken appearance persists or if the baby shows other illness signs. (clevelandclinic.org)
The parent-friendly takeaway:
A sunken soft spot is usually more about hydration or illness than craniosynostosis, but it still deserves medical attention when persistent or paired with symptoms.
Sign #9: Head Growth That Slows or Falls Off the Curve
Head circumference is measured at well-child visits because it helps track head growth over time.
In craniosynostosis, some babies have a head shape change while head circumference continues growing. In others, especially more complex cases, head growth may slow or fall off the expected curve.
The CDC lists slow growth or no growth in the baby’s head size over time as a sign that may be seen in craniosynostosis. (cdc.gov)
Nationwide Children’s notes that the most apparent sign is usually abnormal head shape, but less commonly, head growth may be restricted with measurements “falling off” the pediatrician’s growth curves, which can contribute to pressure buildup. (nationwidechildrens.org)
The practical message:
One head measurement matters less than the trend. Ask whether your baby’s head circumference is following the expected growth curve.
What Does “Falling Off the Growth Curve” Mean?
Growth charts show how your baby’s head circumference compares with other babies of the same age and sex.
A baby does not need to be at the 50th percentile to be healthy. Some healthy babies have small heads. Some have large heads.
The concern is usually the pattern over time.
Questions doctors may ask include:
- Is the head circumference increasing?
- Is the baby staying near the same percentile?
- Has head growth slowed?
- Has the head circumference crossed downward across percentiles?
- Does the head shape look restricted?
- Is the baby developing as expected?
- Are other growth measurements, like weight and length, also changing?
The parent-friendly takeaway:
A small head is not automatically craniosynostosis. A changing head-growth pattern plus abnormal head shape deserves evaluation.
Sign #10: Facial Asymmetry
Some types of craniosynostosis affect the face as well as the skull.
Parents may notice:
- One side of the forehead looks flatter
- One eye looks higher or more open
- One eyebrow looks raised
- The nose seems pulled to one side
- The face looks rotated
- One cheek looks different
- One ear seems shifted
The CDC states that providers will look for problems with the shape of the baby’s face as part of craniosynostosis evaluation. (cdc.gov)
Facial asymmetry is especially important in coronal craniosynostosis because the coronal sutures are near the forehead and upper eye sockets. One-sided coronal synostosis can affect the forehead, brow, eye socket, nose, and facial balance.
The practical message:
If the concern involves the forehead, eyes, brow, nose, or facial symmetry — not just the back of the head — ask whether craniosynostosis should be ruled out.
Sign #11: The Head Shape Does Not Improve With Repositioning
Many babies have positional head-shape changes that improve with:
- Awake, supervised tummy time
- Changing head position while awake
- Treating torticollis with physical therapy
- Reducing long periods in swings, car seats, and bouncy seats when not needed
- Helmet therapy in selected moderate or severe cases
HealthyChildren.org explains that positional skull deformities are usually related to the position where the baby spends the most time and that early position changes can help. It also states that common positional skull deformities do not affect brain growth or intellectual development. (healthychildren.org)
But craniosynostosis does not improve simply because the baby changes position. A fused suture will not reopen with tummy time or repositioning.
The practical message:
If the head shape is worsening, not improving, or does not match the baby’s resting position, ask for reassessment or craniofacial referral.
Sign #12: Torticollis or Strong Head-Turning Preference
Torticollis is tightness or imbalance in the neck muscles that makes a baby prefer turning the head one way.
Torticollis is more strongly associated with positional plagiocephaly than craniosynostosis. That is because a baby who always lies on the same side of the head can develop flattening there.
HealthyChildren.org states that an estimated 85% of babies with torticollis have a positional skull deformity and that infants with torticollis need physical therapy. (healthychildren.org)
Parents may notice:
- Baby always looks right or left
- Baby resists turning one direction
- Baby tilts the head
- Feeding is easier on one side
- One side of the back of the head is flat
- Neck motion seems limited
The patient-friendly takeaway:
A head-turning preference often points toward positional flattening, but the baby still needs evaluation if the skull shape looks unusual, severe, or not improving.
What Signs Are More Likely Positional Flat Head?
Positional plagiocephaly or positional brachycephaly may be more likely when:
- The head looked more typical at birth
- Flattening developed during the first weeks or months
- The baby prefers turning one direction
- Torticollis is present
- The flatness is at the back or one back side of the head
- The ear on the flat side shifts forward
- The forehead on the flat side looks more prominent
- The head looks like a parallelogram from above
- The shape improves with repositioning or physical therapy
- Head circumference is growing normally
HealthyChildren.org describes deformational plagiocephaly as asymmetric back flattening with forehead prominence and forward ear shift on the flat side, often in babies with a preferred sleep direction or torticollis. (healthychildren.org)
The practical message:
If the head shape follows where the baby rests and there is a head-turning preference, positional flattening becomes more likely.
What Signs Are More Concerning for Craniosynostosis?
Craniosynostosis may be more concerning when:
- The head shape looked unusual at birth
- The shape does not improve after newborn molding
- The shape becomes more obvious as the baby grows
- There is a hard ridge along a suture plus abnormal head shape
- The head is long and narrow
- The forehead is triangular
- One forehead or brow is flat
- One eye looks higher, larger, or differently shaped
- The nose seems pulled to one side
- The head is short, wide, and tall with forehead changes
- Back flattening has backward or lower ear shift
- The head looks trapezoid-shaped from above
- Head circumference growth slows or drops percentiles
- More than one area of the skull seems restricted
- The pediatrician is unsure whether it is positional
The CDC states that craniosynostosis is usually first noticed because of abnormal skull shape and may be associated with hard suture edges, unusual soft spots, no soft spot, slow head growth, or facial-shape problems. (cdc.gov)
The parent-friendly takeaway:
Craniosynostosis is more likely when the head shape fits a suture-fusion pattern rather than a simple pressure pattern.
Signs That May Suggest Pressure Inside the Skull
Most parents notice head shape first, not pressure symptoms.
But pressure symptoms are important because craniosynostosis can sometimes restrict skull growth, especially in multisuture or syndromic cases.
Possible signs of increased intracranial pressure may include:
Full or bulging soft spot
Unusual sleepiness
Being less alert than usual
Very noticeable scalp veins
Increased irritability
High-pitched cry
Poor feeding
Projectile vomiting
Increasing head circumference
Developmental delays
Johns Hopkins lists these signs as possible symptoms of elevated intracranial pressure in craniosynostosis. (hopkinsmedicine.org)
Nationwide Children’s also lists high-pressure signs such as headache, nausea, vomiting, lethargy, difficulty moving the eyes upward, eyes looking downward, and a bulging or tense soft spot. (nationwidechildrens.org)
The practical message:
Head shape concerns can often be evaluated through scheduled referral, but pressure symptoms, severe illness, repeated vomiting, breathing problems, seizures, or decreased alertness require prompt medical attention.
When to Ask for a Craniofacial Referral
Ask your pediatrician about referral to a craniofacial team, pediatric neurosurgeon, or craniofacial plastic surgeon if:
- Craniosynostosis is suspected
- The diagnosis is unclear
- The head shape is worsening
- The head shape does not improve with repositioning
- There is a hard suture ridge plus abnormal head shape
- The head is long and narrow
- The forehead is triangular
- One side of the forehead or eye area looks different
- The back-of-head flattening pattern is unusual
- The ear on the flat side is shifted backward or lower
- Head growth is slowing or crossing percentiles
- More than one suture may be involved
- There are possible pressure symptoms
- You want confirmation before helmet therapy
The AAP clinical report was created to improve recognition, timely referral, and differentiation of craniosynostosis from deformational and other nonoperative head-shape changes. (publications.aap.org)
The practical message:
You do not need to be certain before asking for a referral. If craniosynostosis is a real possibility, early specialist evaluation is reasonable.
What Doctors Look For During Evaluation
A pediatrician or craniofacial specialist may:
Measure head circumference
Review the growth curve
Look at the head from multiple angles
Feel along the sutures for ridges
Check the soft spot
Assess forehead shape
Assess eye and brow symmetry
Assess ear position
Assess nose and facial symmetry
Look for torticollis
Ask when the head shape was first noticed
Ask whether the shape is improving or worsening
Ask about feeding, sleep, breathing, vision, hearing, and development
Consider imaging if needed
Discuss referral to neurosurgery, craniofacial surgery, ophthalmology, genetics, ENT, or physical therapy depending on the pattern
Mayo Clinic states that craniosynostosis diagnosis may include a physical exam in which the healthcare professional feels for suture ridges and looks for changes in facial features and head shape, and imaging may be used to show whether sutures have fused. (mayoclinic.org)
The patient-friendly takeaway:
The evaluation is about the pattern, not one isolated sign.
Does My Baby Need Imaging?
Maybe.
Some babies are diagnosed clinically by experienced specialists. Others need imaging to confirm whether a suture is fused and to plan treatment.
Imaging may include:
- Cranial ultrasound
- X-ray in selected cases
- CT scan
- 3D CT scan
- MRI in selected cases
- 3D surface photography or laser scanning
The CDC notes that CT can show details of the skull and brain and help confirm diagnosis. (cdc.gov) Mayo Clinic states that CT, MRI, or cranial ultrasound can show whether sutures have fused and that imaging, laser scans, and photos may help with precise skull measurements and surgical planning. (mayoclinic.org)
The practical question:
“Should we see the craniofacial team first, and what imaging would actually change the plan?”
What Parents Can Track at Home
Parents should not have to diagnose craniosynostosis at home, but they can bring helpful observations.
Track:
- When you first noticed the head shape
- Whether the shape is improving, worsening, or unchanged
- Whether the baby always turns one direction
- Whether tummy time or repositioning is helping
- Whether there is a ridge and where it is
- Whether the soft spot is easy or hard to feel
- Whether feeding, sleep, breathing, or development have changed
- Whether head circumference is following the expected curve
HealthyChildren.org suggests looking at a baby’s head after bath time when the hair is wet and checking whether the back of the head is evenly round, the ears are even, and head/forehead width looks balanced; it advises talking with the pediatrician if parents notice changes or concerns. (healthychildren.org)
The practical message:
Parents are often the first to notice patterns over time. Those observations can help the doctor.
Photos That Can Help the Doctor
Photos can help show head shape changes over time.
Useful angles include:
- Top of the head
- Front of the face
- Back of the head
- Left side profile
- Right side profile
- Three-quarter views
- Ear-level comparison from above
- Back hairline if back flattening is present
Tips:
- Take photos after bath time when hair is wet.
- Use similar lighting.
- Use the same distance and angles.
- Take photos every 2 to 4 weeks if monitoring.
- Bring photos to the pediatrician or craniofacial appointment.
The practical takeaway:
A top-view photo is often especially helpful for distinguishing long, triangular, parallelogram, trapezoid, short-wide, or asymmetric patterns.
What Not to Do
When parents are worried, it is easy to try products or strategies that are not safe or not useful.
Do not:
Use head-shaping pillows
Put a baby to sleep on the stomach to fix head shape unless specifically instructed by a healthcare professional
- Assume a helmet will fix every head-shape issue
- Assume a ridge always means surgery
- Assume a small soft spot means craniosynostosis
- Wait months if the head shape is worsening or clearly abnormal
- Ignore feeding, vomiting, breathing, or alertness changes
HealthyChildren.org states that infant head-shaping pillows are not safe, can create an unsafe sleep environment, may contribute to suffocation risk, and are not proven effective for positional skull deformities, craniosynostosis, or other medical purposes. (healthychildren.org)
The patient-friendly message:
Safe sleep still matters. Use back sleeping for sleep, tummy time only while awake and supervised, and ask your pediatrician for a safe plan.
What Parents Should Do Next
If you are worried about signs of craniosynostosis, a calm plan can help.
1. Schedule a pediatrician visit
Ask for a focused head-shape evaluation.
2. Ask what pattern the doctor sees
Use direct questions:
- “Does this look positional or like a fused suture?”
- “Which suture are you concerned about?”
- “Is the head circumference growing normally?”
3. Ask whether referral is appropriate
If the diagnosis is unclear or craniosynostosis is possible, ask about craniofacial referral.
4. Bring photos
Photos can help show how the head shape has changed.
5. Ask before starting helmet therapy
If craniosynostosis is possible, ask whether a craniofacial team should confirm the diagnosis before helmeting.
6. Watch for urgent symptoms
Repeated vomiting, unusual sleepiness, breathing trouble, seizures, poor feeding, or a persistently bulging soft spot should not wait.
You can ask:
- Does my baby’s head shape look normal, positional, or concerning for craniosynostosis?
- Which suture are you concerned about?
- Do you feel a hard ridge along a suture?
- Is the soft spot normal for my baby’s age and head growth?
- Is my baby’s head circumference following the growth curve?
- Has head growth slowed or crossed percentiles?
- Does my baby have torticollis?
- Should we start physical therapy?
- Should we try repositioning?
- How long should we wait before reassessing?
- Does this head shape need a craniofacial referral?
- Should imaging wait until after a specialist evaluates my baby?
- Should we see a pediatric neurosurgeon or craniofacial plastic surgeon?
- Are there any symptoms that should make us call urgently?
At the specialist visit, ask:
- Does my baby have craniosynostosis?
- Which suture or sutures are involved?
- Is this single-suture or multisuture craniosynostosis?
- Does this look isolated or syndromic?
- Could this be positional head shape instead?
- Do we need imaging?
- If imaging is needed, what type and why?
- Is head growth normal?
- Is there any concern for increased intracranial pressure?
- Do we need an eye exam?
- Do we need genetic testing?
- Is surgery recommended?
- What are the goals of surgery?
- What happens if we monitor?
- Would helmet therapy have a role?
- How does my baby’s age affect treatment options?
- What symptoms should prompt an urgent call?
- How often will follow-up happen?
Red Flags: When to Call a Doctor Promptly
Call your child’s healthcare professional promptly if your baby has:
A rapidly worsening head shape
A hard suture ridge with abnormal head shape
Head circumference that is not growing as expected
A full, tense, or persistently bulging soft spot
Repeated or projectile vomiting
Poor feeding
Unusual sleepiness or decreased alertness
Extreme irritability
High-pitched cry
Very noticeable scalp veins
Developmental delay or loss of skills
New eye movement concerns
Difficulty moving the eyes upward
Eyes that seem persistently driven downward
Seizure-like activity
Breathing trouble
Signs of dehydration, such as fewer wet diapers and a sunken soft spot
Johns Hopkins lists full or bulging fontanelle, sleepiness, scalp veins, irritability, high-pitched cry, poor feeding, projectile vomiting, increasing head circumference, and developmental delays as possible signs of elevated intracranial pressure in craniosynostosis. (hopkinsmedicine.org)
Seek urgent or emergency care if your baby is difficult to wake, has trouble breathing, has seizure-like activity, has repeated vomiting, has a bulging soft spot with illness or lethargy, or seems seriously unwell.
Common Parent Fears
“Does every weird head shape mean craniosynostosis?”
No. Many head-shape changes are positional. HealthyChildren.org states that common positional skull deformities do not require surgery and do not affect brain growth or intellectual development. (healthychildren.org)
“Does a ridge mean my baby needs surgery?”
Not always. A ridge can be a clue, but it must be interpreted with head shape, growth, and suture pattern. For example, Nationwide Children’s states that metopic ridging without triangular head shape is a normal variant and does not require surgical correction. (nationwidechildrens.org)
“Does a closed soft spot mean craniosynostosis?”
Not by itself. A less noticeable soft spot can be normal if head growth is normal. Cleveland Clinic notes that if a baby’s soft spot is less obvious but the head is growing normally, there may not be much cause for concern, though a provider may order imaging if early closure is suspected. (clevelandclinic.org)
“Did I cause this?”
Usually, no. The CDC states that the causes of craniosynostosis are unknown in most infants; some cases involve a single-gene abnormality, but many likely involve a combination of genes and other factors. (cdc.gov)
“Can I wait and see?”
Sometimes monitoring is appropriate, especially for mild positional flattening or an isolated benign ridge. But if the head shape is worsening, clearly abnormal, associated with a ridge, facial asymmetry, slow head growth, or possible pressure symptoms, ask for timely referral.
How to Explain the Signs to Family Members
Here is a simple explanation:
“Craniosynostosis means one of the baby’s skull growth seams closes too early. The first sign is often head shape. A ridge, soft spot change, or flat area does not prove craniosynostosis by itself. Doctors look at the whole pattern: head shape, suture ridges, soft spot, growth curve, face and eye symmetry, and whether the shape is improving or worsening. Most back flat spots are positional, but certain patterns need a craniofacial specialist to rule out a fused suture.”
This can help family members understand why you may be watching the head shape carefully without assuming the worst.
- The most common first sign of craniosynostosis is an unusual head shape.
- Different sutures create different head-shape patterns.
- Sagittal craniosynostosis often causes a long, narrow head.
- Metopic craniosynostosis can cause a triangular forehead.
- A metopic ridge alone can be normal if the forehead is not triangular.
- Coronal craniosynostosis can cause forehead, brow, eye, nose, or facial asymmetry.
- Bicoronal craniosynostosis can cause a short, wide, tall, or flat-front head shape.
- Lambdoid craniosynostosis is rare but can flatten the back of the head.
- Most back-of-head flattening is positional plagiocephaly, not craniosynostosis.
- A skull ridge matters most when paired with an abnormal head-shape pattern.
- A small or hard-to-feel soft spot does not automatically mean craniosynostosis.
A persistently bulging or sunken soft spot, especially with illness symptoms, deserves medical attention.
Head circumference trends matter more than one measurement.
Head growth that slows or falls off the curve should be evaluated.
Repositioning and physical therapy can help positional head-shape changes, but they do not reopen a fused suture.
A craniofacial referral is appropriate when the diagnosis is unclear, the pattern is concerning, or the head shape is worsening.
The simplest parent-friendly summary is:
Parents usually notice craniosynostosis because of head shape first. Ridges, soft spot changes, facial asymmetry, and growth patterns can add clues, but the diagnosis depends on the whole pattern and should be confirmed by the right medical team.
Frequently Asked Questions About Signs of Craniosynostosis
What is usually the first sign of craniosynostosis?
The first sign is usually an abnormally shaped skull. The CDC states that craniosynostosis is usually first noticed because of abnormal skull shape, and providers may also check for hard suture edges, unusual soft spots, no soft spot, slow head growth, and facial-shape problems. (cdc.gov)
Does a ridge on my baby’s skull mean craniosynostosis?
Not always. A hard ridge along a suture can be a sign of craniosynostosis, but some ridges can be normal or related to newborn molding. The key question is whether the ridge is paired with an abnormal head-shape pattern.
Does a ridge down the forehead mean metopic craniosynostosis?
Not always. A metopic ridge can be normal. Nationwide Children’s states that metopic ridging without a triangular forehead shape is a normal variant and does not require surgical correction. (nationwidechildrens.org)
What head shape suggests sagittal craniosynostosis?
A long, narrow head shape can suggest sagittal craniosynostosis. Johns Hopkins explains that early fusion of the sagittal suture causes the skull to become long front-to-back and narrow ear-to-ear, a shape called scaphocephaly. (hopkinsmedicine.org)
What head shape suggests metopic craniosynostosis?
A triangular or pointed forehead can suggest metopic craniosynostosis. The CDC describes metopic synostosis as causing the top of the head to appear narrow in the front and broad in the back, a shape called trigonocephaly. (cdc.gov)
What signs suggest coronal craniosynostosis?
One-sided forehead flattening, brow difference, one eye looking higher or differently shaped, and nose deviation can suggest coronal craniosynostosis. The CDC states that early closure of one coronal suture may flatten the forehead on that side, raise the eye socket, and pull the nose toward that side. (cdc.gov)
What signs suggest lambdoid craniosynostosis?
Lambdoid craniosynostosis may cause back-of-head flattening with backward or downward ear shift and a trapezoid head shape. Nationwide Children’s notes that lambdoid craniosynostosis is very rare and differs from positional plagiocephaly because the ear and possibly forehead shift backward rather than forward. (nationwidechildrens.org)
Is back-of-head flattening usually craniosynostosis?
No. Most back-of-head flattening is positional. HealthyChildren.org explains that positional skull deformities often happen when a baby spends a lot of time in one position, especially during the first 4 to 12 weeks of life. (healthychildren.org)
Does flat head syndrome affect brain growth?
Common positional skull deformities do not affect brain growth or intellectual development, according to HealthyChildren.org. (healthychildren.org)
Does a closed soft spot mean craniosynostosis?
Not by itself. A less noticeable soft spot can be normal if head growth is normal. Cleveland Clinic states that if the soft spot is less pronounced but the child’s head is growing normally, there may not be much to worry about. (clevelandclinic.org)
What soft spot changes should parents report?
Report a persistently bulging, tense, or sunken soft spot, especially with fever, vomiting, poor feeding, unusual sleepiness, irritability, dehydration signs, head injury, or behavior changes. Cleveland Clinic notes that sunken fontanelles can suggest dehydration, while bulging fontanelles may need medical evaluation. (clevelandclinic.org)
Can head circumference be normal with craniosynostosis?
Yes. Some babies with craniosynostosis still have head circumference growth, especially when only one suture is involved. Doctors evaluate both head size and head shape. Nationwide Children’s notes that abnormal head shape is usually the most apparent sign, while head-growth restriction is less common. (nationwidechildrens.org)
What does slow head growth mean?
Slow head growth means the head circumference is not increasing as expected over time or is falling off the growth curve. The CDC lists slow growth or no growth in head size over time as a possible sign of craniosynostosis. (cdc.gov)
Does torticollis mean my baby has craniosynostosis?
No. Torticollis is more often associated with positional plagiocephaly. HealthyChildren.org states that an estimated 85% of babies with torticollis have a positional skull deformity and need physical therapy. (healthychildren.org)
When should I ask for a craniofacial referral?
Ask for referral if the head shape is worsening, does not improve, looks long and narrow or triangular, includes one-sided forehead/eye asymmetry, has an unusual back-of-head flattening pattern, includes a hard ridge with abnormal shape, or head growth is slowing.
Does my baby need a CT scan?
Maybe. Imaging decisions depend on exam findings and specialist preference. The CDC notes that CT can show details of the skull and brain to help confirm diagnosis, while Mayo Clinic states that CT, MRI, or cranial ultrasound can show whether sutures have fused. (cdc.gov)
What symptoms could suggest pressure inside the skull?
Possible signs include a full or bulging fontanelle, sleepiness, scalp veins, increased irritability, high-pitched cry, poor feeding, projectile vomiting, increasing head circumference, and developmental delays. Johns Hopkins lists these as possible signs of elevated intracranial pressure in craniosynostosis. (hopkinsmedicine.org)
Should I use a head-shaping pillow?
No. HealthyChildren.org states that infant head-shaping pillows are not safe, may create an unsafe sleep environment, may contribute to suffocation risk, and are not proven effective for positional skull deformities or craniosynostosis. (healthychildren.org)
Suggested External Sources for the Published Blog
Use these at the bottom of the published article as a “Sources” section:
CDC — Craniosynostosis Best for: basic definition, first signs, hard suture edges, unusual or absent soft spot, slow head growth, facial-shape concerns, suture-specific head-shape patterns, diagnosis, and treatment overview. (cdc.gov)
Johns Hopkins Medicine — Craniosynostosis Best for: head-shape patterns by suture, signs of elevated intracranial pressure, sagittal/scaphocephaly, coronal, metopic, lambdoid, and parent-level explanation of how fused sutures change skull growth. (hopkinsmedicine.org)
Mayo Clinic — Craniosynostosis: Symptoms and Causes Best for: symptoms, atypical skull shape, suture ridges, facial imbalance, soft spot discussion, other reasons for changed head shape, and complications. (mayoclinic.org)
Nationwide Children’s Hospital — Craniosynostosis Best for: head-shape examples, soft spot may be open or closed, head-growth restriction, high-pressure symptoms, metopic ridge as normal variant, positional plagiocephaly vs lambdoid craniosynostosis, and diagnosis overview. (nationwidechildrens.org)
HealthyChildren.org / American Academy of Pediatrics — Positional Skull DeformitiesBest for: positional plagiocephaly and brachycephaly, torticollis, tummy time, forward ear shift, parallelogram shape, head-shape checks after bath time, brain-growth reassurance for positional skull deformities, helmet therapy, and head-shaping pillow safety. (healthychildren.org)
Cleveland Clinic — Baby Fontanelles / Soft Spots Best for: parent-friendly soft spot explanation, sunken and bulging fontanelle concerns, less noticeable soft spots, hydration signs, and when to contact a healthcare provider. (clevelandclinic.org)
American Academy of Pediatrics — Identifying the Misshapen Head: Craniosynostosis and Related DisordersBest for: differentiating craniosynostosis from deformational head-shape changes, improving recognition and timely referral, fontanelle closure discussion, and clinical head-shape pattern guidance. (publications.aap.org)