Woman, 23, has a rare condition which means she only grew one breast

Becca Butcher, 23, from Barnsley, South Yorkshire, has Poland Syndrome, which means one breast is significantly smaller than the other - her right one is a D cup while the left is an A cup.

Rare condition has made woman the world's most prolific mother

Gynecomastia - Wikipedia

Rare condition causes woman's breasts to grow four bra cup sizes in just one year - and they won't stop growing

Why Are My Breasts Not Growing?

When Does Breast Milk Come In? Stages & Signs

Sagging Breasts Causes, Treatment, and Prevention

Woman has rare condition that means she only grew one breast

Woman baffles doctors by only growing one boob through puberty - Daily Star

Poland Syndrome: What it's like to be a woman born with one boob

Woman with Poland Syndrome only grew one breast

I only grew one boob — and it's a real medical condition

Woman who grew THIRD boob has it removed after the unusual addition made her depressed - Mirror Online

10 reasons for low milk supply, plus tips to increase breast milk - Today's Parent

Tubular breasts: Symptoms, causes, and augmentation

Breast Hypertrophy (Gigantomastia): Causes, Treatment, and More