Varies greatly!: Some 12 year olds have no breast tissue development at all, while other 12 year olds have had a lot of breast development and may be size c or d already. There is no normal when it comes to this age, because it depends on whether the child has entered puberty and how far along they are into it. It is not unusual these days to start as early as 7-8 y/o, but not abnormal to start as late as 14-15.
Answered 6/22/2017
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