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If you've hit puberty then you dont really have a size until you are like 16 then the average size is 34d. So u should b close to that i guess

I am 13 & i wear a 32c, but all my friends wear either 32a or 32aa, so i have big boobs compared to all of them!

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12y ago
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Q: What is the average bra size for a 13 year old girl?
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