When is the Latest for a Baby’s Fontanelle to Close?

A baby’s fontanelle, typically measuring 1.5 to 2.0 centimeters at birth, expands as the head grows in the first few months. Generally, it starts to shrink around 6 months after birth and closes completely by about 18 months. The posterior fontanelle, a triangular space between the occipital and parietal bones at the back of the head, usually closes within 6 to 8 weeks after birth.
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When Should a Three-Month-Old Baby Go to Bed?

A three-month-old baby has not yet established a stable circadian rhythm, so their sleep schedule is not fixed, and each baby’s sleep habits are different. Parents should be cautious not to let their baby reverse day and night, to help them develop good sleep habits.
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