The posterior fontanel, the soft spot on the back of your baby’s head, will close first. It is the smaller of the two fontanels so it doesn’t take as long to close. It normally closes by the time your baby is 2-4 months old.
"The idea is to bring the posterior fontanel forward from the 3, 6, or 9 o'clock position to the 12 o'clock position. Then the baby is more deliverable. In the right-sided position, you rotate it clockwise.
There are usually two soft spots in the skull of a newborn, the anterior and the posterior fontanelle. The posterior fontanelle will close by about 2 months of age. The anterior fontanelle usually closes between 9 and 18 months of age.
The one on the back of her head is called the posterior fontanelle. It's usually smaller than the other and triangular in shape. The one on the top of her head is the anterior fontanelle. It is larger and diamond or kite-shaped.
The posterior fontanelle, on the back of the head, is a small triangle shape that usually closes by the time your baby is eight weeks old. The anterior fontanelle, on the top of the head, is a larger, slightly sunken diamond shape.
Growth rate is still significant, but not as rapid as in the first 2 months
Posterior fontanelle ("soft spot") closes
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The anterior fontanel is about two inches wide and may not be closed completely until your baby is 18 months old. The posterior fontanel is only about a half inch wide and will be closed by the time your baby is three months old, ...
Soft spots found between the cranial bones of the newborn's skull. There are two fontanelles that are usually examined in the newborn period, the anterior and the posterior fontanelles.
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The fontanelles allow for the skull bones to give slightly during birth, and will gradually fuse together of their own accord - over a period of weeks for the small posterior fontanelle, ...
The anterior fontanelle on the top of the head is large and diamond-shaped, and closes at around 18 months. The smaller, triangular posterior fontanelle is at the very back of the head and closes at about six months.
See also: Anterior, Posterior, Fontanel, Pregnancy, Hormone