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There is no average bra size for a 10-year-old girl because each girl develops differently; some slowly and some faster, some earlier and some later. Many girls will begin to go through puberty when they are 10, at which time they will notice changes in the nipple area of their breasts. That is a good time to start wearing a training bra. When your breasts have developed a form and grown larger, you will need a bra. Your mother or a trusted female adult can help you determine the right time to start wearing a bra, as well as the right size.

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