The idea that a woman’s breast size tells you something 
Here are a few important facts:
1️⃣ Genetics play the biggest role
Breast size is largely inherited. If women in a family tend to have larger or smaller breasts, it often runs in the genes.
2️⃣ Body fat affects breast size
Breasts are made mostly of fatty tissue and glandular tissue. When body weight changes, breast size can increase or decrease.
3️⃣ Hormones influence development
Hormones such as estrogen and progesterone affect breast growth, especially during puberty, pregnancy, and menopause.
4️⃣ Breast size does NOT indicate personality or fertility
There is no scientific evidence that breast size reveals anything about:
Intelligence
Sexual behavior
Fertility
Personality traits
5️⃣ Every size is normal
Breasts naturally vary in shape, size, and symmetry, and this variation is completely normal and healthy.