Fontanel Closure and Speech Morning and Late Fontanelle refers to the cartilage connection on the newborn’s head. These cartilages are able to gradually close over the months after birth. Complete closure of the fontanelle indicates that the baby\’s head is maturing. The length of fontanelle closure time is closely related to infant language development. This article will elaborate on the impact of fontanel closure on infant language development from several aspects. Physical development and fontanel