Anterior Fontanelle Closure Age

Time taken after birth for the fontanelles to close the a nterior fontanelle takes the longest time after birth to close.

Anterior fontanelle closure age. Other than the anterior and posterior fontanelles the mastoid fontanelle and the sphenoidal fontanelle are also significant. These fontanelles will close between 6 and 18 months. It is the last to close.

Over time the fontanelles harden and close. It is in the upper front portion of your baby s head at the junction of three different sutures. In contrast apes fuse the fontanelles soon after birth.

The fontanelle at the back of your baby s head usually closes by the time your baby is 2 months old. 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. It may already be closed at birth.

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. On the top of the middle head just forward of center anterior fontanelle in the back of the middle of the head posterior fontanelle the posterior fontanelle usually closes by age 1 or 2 months. The anterior fontanelle is the largest soft spot.

By three months of age the anterior fontanel is closed in 1 percent of infants. By 12 months it is closed in 38 percent. 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.

In the first year 41 6 closed of which 2 7 occurred by 6 months and 13 5 by 9 months. The anterior fontanelle generally closes between 18 and 36 months of age. And by 24 months it is closed in 96 percent.