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?

Average Breast Size & Bra Size in the USA & World

Why do women's boob sizes vary? - Quora

8 Types of Boobs in the World - Different Breast Sizes and Shapes

Why do I have unequal breast size? Know all about breast asymmetry

Dear Dish-It: My Breasts Are Different Sizes, Advice

Why do women's boob sizes vary? - Quora

Why Are My Boobs So Small? And What Can Be Done About It (2023) – topsfordays

Bra Size Chart India – Explore the List of Bra Sizes

Breast Asymmetry: Causes and Diagnosis

Breast Asymmetry: Causes and Diagnosis

Difference in Breast Size: What to do? - Ralph Bashioum MD

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Does Breast Size Matter? La Leche League Canada - Breastfeeding Support and Information