When do babies fontanel close?

Babies have two main fontanels, the anterior and posterior. The posterior fontanel typically closes between 2 to 3 months of age, while the larger anterior fontanel usually closes by 18 months, although it can take up to 24 months for some children. These soft spots allow for the growth of the baby's brain and skull during early development. Regular pediatric check-ups help monitor their closure and overall development.