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10 year old girls are not really supposed to be wearing any kind of cup size.It's best to wear training Bras or sports bras...But if a 10 year old were to wear a cup size it would probably be a 32AA...11,12 and further that's when you really start to wear a cup size.

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12y ago
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Q: What bra cup size should the average 10 year wear?
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