The bones of the newborn skull are not fully ossified and are separated by large areas called fontanelles, which are filled with fibrous connective tissue. The fontanelles allow for continued growth of the skull after birth. At the time of birth, the facial bones are small and underdeveloped, and the mastoid process has not yet formed.
Cut Rita Zahara
“Newborn Skull,” Open Educational Resource (OER) - UNM, accessed February 18, 2020, http://oer.unm.ac.id/items/show/1079.