Girls develop breasts at puberty. On average, this starts at approximately 12 or 13. However it can be earlier or later for that matter.
It all depends. When you start having periods, you should start to develop breast growth, but sometimes you might not get boobs until you are perhaps 15 or 16. I'm 12 and wear a 32C already ...... I'm on my period so maybe you will start your growth soon.
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