The anterior fontanelle closes within?

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Multiple Choice

The anterior fontanelle closes within?

Explanation:
The timing of anterior fontanelle closure reflects skull growth in infancy. The anterior fontanelle, the soft spot on the top of the baby’s skull, stays open to allow the brain to grow during the first year and into the second year. It generally closes by about 9–18 months, with many children closing around 12–18 months. So the 9–18 months window is the best answer. Closing earlier, by 3–9 months, would be unusually early; closing later, at 18–24 months, is later than typical. Therefore, 9–18 months fits the usual pattern.

The timing of anterior fontanelle closure reflects skull growth in infancy. The anterior fontanelle, the soft spot on the top of the baby’s skull, stays open to allow the brain to grow during the first year and into the second year. It generally closes by about 9–18 months, with many children closing around 12–18 months. So the 9–18 months window is the best answer. Closing earlier, by 3–9 months, would be unusually early; closing later, at 18–24 months, is later than typical. Therefore, 9–18 months fits the usual pattern.

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