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Breast and nipple thrush BNT is a yeast infection of the nipple and breast caused by a fungal organism known as Candida albicans, a common cause of all thrush infections. It occurs most commonly in breastfeeding mothers. The infection may lead to severe nipple and breast pain , especially during breastfeeding. This can result in the mother weaning her baby and stopping breastfeeding before she had planned to.

The answer, for the most part, is fairly simple. Men have nipples because nipples develop in the womb before embryos become distinctly male or female. So by the time a Y chromosome kicks in to distinguish a fetus as male, the nipples have already secured their place. Some people think of it this way: Everyone starts out as female in their early development in utero. A few weeks in, the Y chromosome starts creating changes that lead to the development of testes in males. Female fetuses go through changes that will eventually lead to the development of breasts. Our development is different at this point and also during puberty , when secondary sex characteristics like pubic hair form.

The human body is an amazing thing. For each one of us, it's the most intimate object we know. And yet most of us don't know enough about it: its features, functions, quirks, and mysteries. Our series The Body explores human anatomy, part by part. Think of it as a mini digital encyclopedia with a dose of wow.