When Billy's mother brings his new baby sister home from the hospital,the first thing that he asks her is if he can touch her.His mother says yes,but to be careful not to touch the soft spot on her head.Billy's mother is referring to the

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Fontanels are soft spots on a baby's head where the skull bones have not yet fused together. Billy's mother is warning him not to touch this area, as it is delicate and needs to be protected. Vernix is a waxy coating on newborns' skin that helps protect them during birth. Apex refers to the highest point of something, and the corpus callosum is a structure in the brain that connects the left and right hemispheres. Neither of these options is relevant to Billy's mother's warning.

When Billy's Mother Brings His New Baby Sister Home from the Hospital,the