Skull & Cranial Anatomy
Anterior fontanelle
The anterior fontanelle is the diamond-shaped soft spot at the top-front of a baby's head, usually closing by about 18–24 months.
In short: Anterior fontanelle
- It is checked for bulging or tension as a sign of pressure.
- It is the largest fontanelle.
- Its closure timing varies among babies.
- It is a key landmark for monitoring pressure.
What it is
It is the front soft spot on a baby's head, the largest of the fontanelles. It usually closes by about 18–24 months as the skull bones come together.
Understanding Anterior fontanelle
A tense or bulging anterior fontanelle can be an early sign of hydrocephalus or raised pressure, so it is part of routine monitoring in children with encephalocele. Because it is the largest and most accessible fontanelle, it is the one most often examined. Its closure timing varies, and the team interprets it together with head circumference and other signs.
Why it matters
Understanding the anterior fontanelle helps families know what the team is checking and why — a bulging or tense soft spot is a signal of pressure that should prompt evaluation.
Common questions
When does it close?
Usually by about 18–24 months.
Why monitor it?
Bulging can signal increased pressure.
Is it the largest soft spot?
Yes.
Bottom line
The anterior fontanelle is the front soft spot, monitored because bulging can signal raised pressure.
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