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The anterior fontanel, or soft spot on a baby's head, moves up and down due to changes in intracranial pressure and the pulsation of blood vessels beneath it. This movement is a normal physiological response, reflecting the brain's growth and the flexibility of the skull during infancy. As the baby's brain expands and the skull bones gradually fuse, the fontanel will eventually close, typically by around 18 months of age.

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2mo ago

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