Why are breasts different sizes?

During puberty, breasts don't always receive identical amounts of the hormone that makes them grow. Why does this happen, and how common is perfect symmetry anyway?

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Why do women have two different sizes of breasts? - Quora

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Why do women's boob sizes vary? - Quora

Psychological toll of having one breast bigger than the other

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Why your breasts are not the same size

Why do women's boob sizes vary? - Quora

What Determines Breast Size and Shape?

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