Lots of chatter swirls around breast size, and plenty of it is myth. If you strip it down to biology, the story is straightforward: some women have larger breasts because of genetics, hormones, and body composition—not because of anything to do with their vagina. Start with heredity. The blueprint for breast size is mostly in your DNA. If many women in a family have fuller chests, there’s a higher chance daughters and nieces will, too. That doesn’t mean it’s guaranteed—genes mix in complex ways—but family patterns are a strong clue. Hormones do the heavy lifting during key life stages. In...
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