The human skull is made up of many bones joined together to form one very sturdy “helmet” that protects the brain – the skull.
But when a baby is born, these bones are not all joined yet, which means that your newborn’s head will still have soft openings between the bones, called fontanelles. With time, these will close up. Why?
A child’s brain grows at a phenomenal rate, and the skull bone’s growth would never be able to keep up, hence the need for the fontanelles to stay open for a while – in this way your baby’s brain has space to grow bigger fast.
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