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 ...

How Does the Brain Work? And How Does the Nervous System Work? How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from?

A night terror (also called sleep terror) is similar to a nightmare, but is far more dramatic. A child having a night terror wakes up screaming and is impossible to ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

What Is Hand, Foot, and Mouth Disease (HFM)? Hand, foot, and mouth disease (HFM) is a common viral infection that causes painful red blisters in the mouth and throat, and on the hands, feet, and ...

How Does Air Enter the Respiratory System? Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs ...

What Causes Osgood-Schlatter Disease? Osgood-Schlatter disease happens during the growth spurt of puberty. During a child's growth spurt, the bones, muscles, and tendons grow at different rates. In ...

Enteroviruses (en-teh-roe-VY-rus-sez) are a common cause of infection in people of all ages, with symptoms that can range from mild to serious. Most enterovirus infections happen in the summer and ...

How Do I Take a Rectal Temperature? The best way to take a temperature in infants and young children is by taking a rectal temperature. Don't worry — it's a simple and safe process.

Herd immunity is the idea that when many people are immune to (protected from) a contagious infection, it's harder for that infection to spread in a community. Antibody shots against specific germs ...

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!

Can I Breastfeed My Baby if I Have COVID-19? The virus that causes COVID-19 does not seem to spread to babies through breast milk. It’s safe to breastfeed if you have COVID-19. Your breast milk is the ...