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Children are famous for asking about bodily quirks, but moms don't always have answers. For instance, do you know why boys have nipples? George Holcomb, M.D., surgeon-in-chief at Children's Mercy Hospitals & Clinics, in Kansas City, Missouri, says that in the womb, both boys and girls have breast tissue and nipples. Later, in response to estrogen, teenage girls develop breasts -- so they can eventually breastfeed. Boys don't get that same estrogen surge, so their nipples stay flat. Explain that in terms your kid can understand when he asks. Read on for answers to other head-scratchers.
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