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 ...

We've learned a lot about COVID-19. Here are some answers to questions about the virus and pregnancy. Can COVID-19 Cause Problems for a Woman's Pregnancy or Her Baby? Usually, COVID-19 during ...

Aural atresia is when a baby is born without an ear canal. The baby's eardrum either didn't form normally or is missing. There also are problems with the middle ear bones (called ossicles). The parts ...

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 ...

Heavy metals are elements that are found in soil, water, and the air we breathe. Plants take up these metals as they grow and can end up in the food we eat. Our bodies need some heavy metals (like ...

Fifth disease is a viral illness that most kids recover from quickly and without problems. It's especially common in kids ages 5 to 15. Fifth disease is known for a rash that makes a child’s cheeks ...

Talking with your partner about sex might feel awkward at first. But If you and your partner are thinking about having sex, it’s best to talk about it ahead of time. Choosing to have sex — or any type ...

How Do I Take an Axillary (Armpit) Temperature? The axillary (armpit) method is a convenient way to take a child's temperature, especially for kids who can't hold a thermometer in their mouths. But an ...

Is it Safe to Use Household Chemicals During Pregnancy? Some household cleaners and chemicals are safe to use during pregnancy while others are not. Chemicals like ammonia and chlorine might cause ...

Earaches are common in kids and can have many causes. Here’s why they happen and what to do when your child complains of ear pain. Give acetaminophen or ibuprofen as needed to ease pain (check the ...

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 ...

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!