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Genetics has nothing to do with being flatchested?

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I do not understand why I am flatchested. My mother is far from being flat so why havent these genes been passed down to me. Even my little sister is way bigger than me. I'M 17 almost 18 so I'm pretty much done with any developments. It's not like im skinny or anything, I'm actually kind of curvy except up top. Maybe I have a lack of nutrients in my body. What kind of vitamins should someone take to make sure a person is getting proper nutrients through out the body?