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How long does it take for the fontanelles to become bone completely?

User Jon Grant
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Answer:

An infant is born with two major soft spots on the top of the head called fontanels. These soft spots are spaces between the bones of the skull where bone formation isn't complete. This allows the skull to be molded during birth. The smaller spot at the back usually closes by age 2 to 3 months

User Zachary Kniebel
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