Where is fontanel located? The fontanelle is the part of the infant’s head where the skull bones are connected to each other and not yet fully ossified, and is made up of the frontal bone, parietal bone and occipital bone. The fontanelle is a diamond-shaped gap formed by the frontal bone and the parietal bone, and is also commonly known as the “roof of the sky”, which is located in the front center of the top of the head. How old will my baby’s fontanelle close? When babies are born, the diameter of fontanelle on the opposite side is about 1.5-2.0 cm. In the first few months of life, the fontanelle will expand as the head circumference increases, but generally shrinks after 6 months as the frontal and parietal bones gradually ossify, and closes at about 18 months. Does the early closure of fontanel affect the baby’s intelligence? Some children’s fontanelles close at 6-7 months of age, and parents are concerned that this may affect their baby’s intellectual development. Although the fontanelle normally closes around 18 months of age, the fact that some children close their fontanelle early does not mean that their head stops growing because the head circumference stops growing until the fusion of the bones between the bones at 13-14 years of age. Therefore, although some babies have early closure of fontanelle, the head circumference will continue to grow as the brain develops and generally will not affect the development of intelligence. However, there is a situation in which children with small malformed heads, whose fontanels close early, have poor brain development and therefore have delayed intellectual development. Therefore, for premature closure of fontanelle to be analyzed on a case-by-case basis to determine whether it will affect the child’s intellectual development, the most appropriate method is to regularly measure the head circumference and follow up the child’s neuropsychiatric developmental process. Conclusion] If the growth rate of head circumference is within the normal range and the child’s neuropsychiatric development is in accordance with his or her age, then even if the fontanelle is prematurely closed, it will not affect the child’s intellectual development.