Let's get one thing straight: boobs are boobs. They can be round or flat, plump or small, pointy or saggy, wide-set or forward-facing. And did you know there are eight different types of nipples? That's right.
Kids' Health - Topics - Breasts - info for girls who are nearly teens
There is no perfect shape or size for breasts. Normal breasts can be large or small, smooth or lumpy, and light or dark. Your breasts start growing when you begin puberty. During puberty the hormone levels in your body change, which causes your breasts to develop and your periods to start. The inside of your breasts is made up of fatty tissue and milk-producing glands, called mammary glands.
You may have many changes in your breasts as a teen and young adult. Some changes are linked to your period. Others are linked to birth control pills, or to other hormonal forms of birth control.