Question

Why are the bones in the cranium not joined in newborn babies?Why do they fuse later on?​

Answer 1

Answer:

During infancy and childhood, the sutures are flexible. This allows the brain to grow quickly and protects the brain from minor impacts to the head (such as when the infant is learning to hold his head up, roll over, and sit up). Without flexible sutures and fontanelles, the child's brain could not grow enough.