As to why it is like that is a hard thing to answer, since the answer in my opinion will always be 'because evolution'. read more
The skull is not fused in order for the child’s head to pass safely through the birth canal. This helps the mother and child, if the skull was fused, it would be extremely hard for the child’s head to fit through the canal and cause damage to both the child’s head and the mothers vaginal area. read more
Craniosynostosis is a birth defect that involves the development of an infant's skull. When this defect is present, one or more of the soft spots in the skull close before they should. This can cause pressure in the skull and, in some cases, impede brain development. Craniosynostosis is often treated with surgery to reopen the fused area. read more
Much like the Earth's tectonic plates, the bones are able to move side to side. This makes the baby's skull more malleable and facilitates the process of giving birth. Because of this shifting, most babies are born with elongated heads. As the baby grows, the bones fuse, therefore resulting in the sutures found present in adult skulls. read more