Breast Size : Breast sizes in teen age girls today, perhaps due to food additives, animal feeds , and other dietary and environmental effects, are perhaps reaching "adult" sizes earlier after the onset of puberty. There is no "normal, " and often there is a "surge" that represents your hormone levels rising rapidly, but this may dissipate. Body fat levels affect chest size, of course. Give yourself time.
Answered 9/18/2017
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