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When to Fontanelles Close?

Sarah Jenkins • • 7 min read
When to Fontanelles Close?

The posterior fontanelle usually closes by age 1 or 2 months. It may already be closed at birth. The anterior fontanelle

anterior fontanelle
The anterior fontanelle (bregmatic fontanelle, frontal fontanelle) is the largest fontanelle, and is placed at the junction of the sagittal suture, coronal suture, and frontal suture; it is lozenge-shaped, and measures about 4 cm in its antero-posterior and 2.5 cm in its transverse diameter.
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usually closes sometime between 9 months and 18 months. The sutures and fontanelles are needed for the infant's brain growth and development.

At what age does the frontal fontanelle close?

The anterior fontanelle takes the longest time after birth to close. It will take between 12 to 18 months for the sutures to solidify here. The fontanelle is usually closed by the time the baby completes its second birthday.

What happens if fontanelle doesn't close?

Soft spot that doesn't close

If the soft spot stays big or doesn't close after about a year, it is sometimes a sign of a genetic condition such as congenital hypothyroidism. What you should do: Talk to your doctor about treatment options.

Sarah Jenkins
Author

Sarah Jenkins

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.