Every newborn will have at least one forehead at birth, that is, the front fontanel, and the forehead itself is the joint of the skull. The back fontanel is closed or close at birth, and usually closes up and down three months after birth. The anterior fontanel is about 1 to 2 cm in size and closes at one to two years after birth. After the baby is born, the posterior fontanel has become smaller or closed, and it will be closed at the latest 6-8 weeks after the baby is born. The anterior fontanel will be 1-50px when the baby is born, and then it will gradually increase with the increase of the skull. When the baby is 6 months old, it will gradually decrease with the slow calcification of the skull, and it will close when the baby 1 year and a half, and the latest closing time is 2 years old.

If the baby is over 2 years old and the fontanel has not been closed, the gap is still very big. Parents should take the baby to the hospital for help. Some mothers will wonder: why is the baby's forehead gone before the fontanel door is closed? Will this affect the baby's brain development? But in fact, many times, the closure that my mother sees is probably an illusion. Some babies seem to just have their foreheads closed, and there is no obvious "crack" when the mother touches the baby's head. In fact, the baby's fontanel is not completely closed. First, the mother's baby's fontanelle is particularly concerned, afraid of hard touch. Second, even though the fontanel of the baby seems to be closed, there are still seams.

The brain volume will still develop with the growth of the brain, so there is no need to worry about it. If the mother is really worried, she can take the baby to the hospital to find a doctor to clarify. Is it abnormal for a baby whose front fontanel is closed within one year old or whose forehead is not closed at two years old? No, the time when the front fontanel is closed is related to the size of the forehead after birth. Anterior fontanels usually close earlier than those born small, on the contrary, they close later. The fontanel closed prematurely, and some babies were born with small foreheads. For many months, the forehead has been closed to the size of a fingertip, and the baby's head circumference has not improved very well.

In that case, parents should be vigilant. Premature closure of fontanelle is directly related to brain development, and microcephaly or mental retardation may occur. If the fontanel closes prematurely, but the baby's head circumference grows normally, it should be different. Although the fontanel will be closed prematurely, the baby's head circumference will grow and develop again, and the normal rate will generally not harm the brain development. The forehead closed too late. Such a thing should take into account the problem of brain edema, and take the baby to the hospital for examination in time. Therefore, parents should regularly and accurately measure the baby's head circumference. If the baby's head circumference has improved normally in the middle and late stages, then parents will be worried.