Anterior Fontanelle Closure Age

In humans all fontanelles are generally fused by the fifth year of life with 38 of fontanelles closed by the end of the first year and 96 of the fontanelles closed by the second year.

Anterior fontanelle closure age. Some parents may feel anxious about touching the fontanelles. The fontanelle at the back of your baby s head usually closes by the time your baby is 2 months old. It persists until approximately 18 24 months after birth after which it is known as the bregma the precise timing of the anterior fontanelle closure is quite variable and the research literature shows cases of closure from 6 months that may represent a normal.

Other than the anterior and posterior fontanelles the mastoid fontanelle and the sphenoidal fontanelle are also significant. Two fontanelles usually are present on a newborn s skull. And by 24 months it is closed in 96 percent.

The fontanelle at the top usually closes sometime between the ages of 7 months and 18 months. These fontanelles will close between 6 and 18 months. In humans the sequence of fontanelle closure is as follows.

The anterior fontanelle generally closes between 18 and 36 months of age. It will take between 12 to 18 months for the sutures to solidify here. By three months of age the anterior fontanel is closed in 1 percent of infants.

Over time the fontanelles harden and close. Compared to data in older textbooks this suggests a trend towards earlier closure of the fontanelle. It is the last to close.

It is lozenge shaped and measures about 4 cm in its antero posterior and 2 5 cm in its transverse diameter the fontanelle allows the skull to deform during birth to ease its passage through the birth canal and. By 12 months it is closed in 38 percent. It is in the upper front portion of your baby s head at the junction of three different sutures.