DearAbby92 answered Wednesday June 1 2011, 11:36 pm: Usually it's just genetics. If your mom has a small bust, you probably will too. Then again, if you have a busty aunt or grandmother, then you may get that. The same thing that makes girls flat chested makes them tall, short, skinny, or thicker. It's just your own individual body type, and nothing to be ashamed of.
There are some disorders that will cause flat chest as a symptom, like someone who is not producing the proper hormones to develop. If this was a problem for you, your doctor should have caught it.
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