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?

The 14 Best Bras for Asymmetrical Breasts of 2024

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Is It Normal to Have Different-Sized Breasts? - GoodRx

Psychological toll of having one breast bigger than the other

Breast Asymmetry: 9 Reasons You Have Uneven Breasts - HealthyWomen

How to Determine Bra Size, Bra Fitting

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

How to choose the right bra cup size! For big breasts, and small

FEATURE: Different Bra Sizes - Art + Animations - Episode Forums

Asymmetry of the chest: what to do if the breasts are of different sizes. How to fix breast asymmetry

ELI5: Why are my girlfriend's boobs different sizes? : r

7 Strange Facts About the Female Body