Parents expect temper tantrums from 2- and 3-year-olds. But angry outbursts don't always stop after the toddler years. Older kids sometimes have trouble handling anger and frustration too. Some kids ...
The thyroid is a small gland below the skin and muscles at the front of the neck, at the spot where a bow tie would rest. It makes two types of thyroid hormones: T3 (triiodothyronine) and T4 ...
A changing voice is one of the many developments that happen to both girls and guys when they reach puberty. Learn more about what happens when someone’s voice is changing. The larynx, which is ...
Hirschsprung (HERSH-sproong) disease affects the intestine of newborns, babies, and toddlers. It makes them have trouble emptying their bowels. Most of the time, the problems with pooping start at ...
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 ...
Click through this slideshow to learn more about the kidneys and urinary tract. The bean-shaped kidneys filter waste products out of the bloodstream and dispose of them by creating urine. Urine is ...
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. In this soft bone ...
The thyroid (say: THYE-royd) is a gland, which is an organ that makes special chemicals called hormones (say: HOR-moans). The thyroid is shaped like a little butterfly or bow tie and it sits under the ...
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 ...
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 ...
What Is the Hepatitis A Vaccine? The hepatitis A vaccine (HepA) protects against hepatitis A, a contagious liver infection caused by the hepatitis A virus (HAV) virus. The vaccine is given in 2 shots ...
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?