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?

How to properly measure your bra size at home in 4 simple steps

My Breasts Are Different Sizes – Am I Normal?

Watch Stuff Mom Never Told You

My breasts are different sizes – how do i find the right bra?

Breast Asymmetry: 9 Reasons You Have Uneven Breasts - HealthyWomen

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

How Much Do Boobs Sweat?

The infuriating truth about bra fittings revealed

Why are nipples naughty?

LOLspider.com - Just for Fun

Why are nipples naughty?

Sleep: Men vs. Women

Why Do My Boobs Get Bigger Before My Period?

Do Cup sizes stay the same throughout the back size?