Infant skeleton on an anterior view with the skull in profile, pediatrics. This illustration represents the entire skeleton of the baby. The skeleton at this age contains 206 bones. We notice that the bones do not meet. This peculiarity of the infant's skeleton allows it to follow its growth. The skull is made up of bony plates, but also of fontanelles and sutures made of connective tissue. These structures give it great elasticity, allowing the baby to pass through the pelvic strait during birth. Bone tissue in newborns is cartilaginous and flexible. Bone maturity occurs between 18 and 25 years.