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Why are some girls flat chested? Watch

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    From a genetics perspective, the answer of gene expression can be very complicated, but simple enough to say that the 'instructions' for body shape and size vary between people. You get these genes from your mum and dad so you will most likely be similar to people you are related to. To stay with the 'instructions' metaphor, though, many things contribute to how completely your instructions will get followed - like making a cake. If you forget to add eggs or flour, you'll end up with a different product at the end. The most common of these factors for human growth is nutrition. Better nourished females will develop more completely.
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    (Original post by stefano865)
    :spank:
    spank me hard'r sirrah
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    They dont actually know, its just genetics, they think it might be soemthing to do with hormones. They can still breastfeed.
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    Genetics as well as body fat percentage. Fat girls generally have bigger boobs.
 
 
 
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