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Breast Development continued...

Your nipples also change during puberty. They can become pink or dark brown, turned inward or out. Sometimes hairs grow around them. All of this is normal.

If you want to get an idea about what your breasts might look like as a woman, look at your mom. Your final breast size is based partly on heredity. “Your breasts aren’t necessarily going to be the same as your mom’s because you’ve got your dad’s genes added in, but you can look back at your ancestors and get a pretty good feel for it,” Holmes says.


Two years or so after your breasts start to develop, you'll probably get your first period. Periods usually last between two and eight days and come every 21 to 35 days. A 28-day cycle is common, but often it takes a while before your periods are regular.

Each month, the lining of your uterus thickens with blood to help a fertilized egg grow. When you don't become pregnant, that lining sheds, and blood comes out of your vagina. Only a couple of tablespoons of blood are released during your period, but it can seem like a lot more.

Vaginal Discharge

You may notice white, sticky stuff in your underpants. That's the fluid that keeps your vagina moist and clean. Vaginal discharge may become thicker and stickier at some points during your menstrual cycle. It has a slight odor but most people can't smell it. Bathing regularly with soap can help reduce the odor if it bothers you.

If your vaginal discharge becomes itchy or irritated, has a strong odor, or is dark yellow or greenish, you may have a vaginal infection. See your doctor.

Body Hair

Puberty brings hair to your body in new places: under your arms, in your genital area, and maybe even on your upper lip. The hair on your arms and legs may also get darker or thicker.

Pubic hair usually starts with a few straight strands and becomes curlier and darker as it grows. Eventually it grows into a thick triangle over the pubic bone and spreads a little to your inner thighs. This growth may start at the beginning of puberty or any time during it.

If you grow hair on your chest or chin, though, see your doctor. You may have a hormone imbalance that needs to be corrected.

Girl to Woman: Your Changing Body

Teen girls: See how your body changes during puberty.
View slideshow