How much do you know about your heart? Find out by taking this quiz!

It’s normal for people to masturbate (touch or rub their own genitals because they like the way it feels). Some people do it to relieve stress or tension. It’s nothing to be ashamed of or embarrassed ...

Just about every guy wonders how he measures up "down-there." Here's the lowdown for any guy who's ever worried about whether his penis is a normal size. There is a wide range of normal penis sizes.

Get the facts about sexual health with articles on puberty, periods, birth control, infections, and much more.

A period is when blood comes out through a girl's vagina. It is a sign that she is getting close to the end of puberty. Puberty is when your body goes from looking like a kid's into looking more like ...

Girls have lots of questions about the body changes of puberty. When will my breasts grow? What's the "normal" age to get your first period? Watch this video and find out!

Nemours Children's Health is committed to transforming the health of children by going beyond medicine to improve the health of the world in which every child lives. We founded KidsHealth.org and ...

What Is Respiratory Syncytial Virus (RSV)? Respiratory syncytial (sin-SISH-ul) virus (RSV) is a major cause of respiratory illness in children. The virus usually causes a common cold. But sometimes it ...

Like most parts of the body, breasts can be sore from time to time for a number of reasons. Breast pain is common but rarely serious. Here are some possible causes and tips for how to feel better.

My breasts are small. Can I make them larger? Just like eye color or height, your genes decide your breast size. If you're in your teens, your breasts may still grow and change, but they may also have ...

Sexually transmitted diseases (STDs) are infections spread from person to person during sex (vaginal, oral, or anal) or close sexual contact. STDs are also called sexually transmitted infections, or ...

A period is a release of blood from a girl's uterus, out through her vagina. It is a sign that she is getting close to the end of puberty. It also means that she can get pregnant if she has sex. There ...