At birth, the anatomy of the skull includes several soft spots, 1) called/calling/having called fontanels.

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Sometimes this happens prematurely, a disorder 2) known/knowing/ having been known as craniosynostosis.
Behind the frontal bone are two parietal bones, 3) attached/having attached/attaching to it by the coronal suture.
Directly behind the parietal bones, 4) attached/attaching/being attached by the lambdoidal sutures, is the occipital bone, a small bone at the back of the skull.