When you feel the top of your baby's head, you'll notice two soft areas. These soft spots, called fontanelles, are where your baby's skull bones haven't grown together yet.
The fontanelle toward the front of the scalp is a diamond-shaped spot roughly the size of a quarter. Though it's usually flat, it may bulge when your baby cries or strains. By nine to 18 months, this fontanelle will be filled in with hard bone.
The smaller, less noticeable fontanelle at the back of the head is the size of a dime and closes around six weeks after birth.
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