Pregnancy breast changes
Milk-producing tissue develops in the breasts during pregnancy. This often alters the size or shape of your breasts. Ordinarily, fat gives your breasts shape and contributes to its size. If the fat in your breasts is replaced by glandular tissue, you’ll feel that they’re heavier but not much bigger. If the glandular tissue develops and the fatty tissue remains, you’re likely to notice an increase in the size of your breasts.