Babies born more than 3 weeks earlier than their expected due date are called "premature." Premature babies (preemies) didn't have enough time to grow and develop as much as they should have before ...

The Internet is amazing! But it also has some things you need to watch out for. You're always you, of course. But if you use a smartphone, tablet, or computer to play games and text with friends, you ...

Adenoids are a patch of lymphoid tissue that sits at the very back of the nasal passage. Like tonsils, adenoids help keep the body healthy by trapping harmful bacteria and viruses that we breathe in ...

Lead is a metal that's found in the environment and many consumer products. It can be toxic (poisonous) to people and animals. Lead poisoning happens when too much lead gets into the body. In kids, ...

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not ...

Parents might be surprised by how their newborn looks. Before birth, babies are immersed in amniotic fluid and folded up in an increasingly tight space. Then in most deliveries, they're pushed through ...

Thinking about an upcoming hospital stay can make people feel a little worried. But if you need to go to the hospital, knowing what to expect before you get there can make things a little easier.

What Is the Respiratory System? When we breathe, the respiratory system takes in oxygen and sends out carbon dioxide. The cells in our bodies need fresh oxygen to stay alive. As cells do their jobs, ...

Cancer is a scary word. Almost everyone knows someone who got very sick or died from cancer. Most of the time, cancer affects older people. Not many kids get cancer, but when they do, very often it ...

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?

What Are Bones and What Do They Do? Bones provide support for our bodies and help form our shape. Although they're very light, bones are strong enough to support our entire weight. Bones are made up ...

An accident or injury can occur in any part of your home. Some safety hazards are obvious — such as a toy truck left lying at the top of the stairs. Others are not so easily identified — such as a ...