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It depends upon the person. Some girl's breasts grow until they're 18, some until they're 13. It just depends on your genes.

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13y ago
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14y ago

Around 10.5 years old.

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Q: How old do you have to be before your breast start growing?
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Related questions

Can breast formation start before start of periods in a 9 year old?

Yes they can. Some even before that age.


If your ten year old daughter just start growing breast and in one month they start to get bigger than normal should you be suspicious?

No--she is going through puberty.


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