estar inquieto o irritable y llorar mucho (a menudo con un llanto agudo) tener problemas para dormir y bostezar mucho tener temblores o movimientos espasmódicos tener rigidez en brazos y piernas tener ...

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 Much Sleep Do School-Age Kids Need? School-age kids need 9–12 hours of sleep a night. Homework, sports, and after-school activities, screen time (on computers, TVs, smartphones, and other devices) ...

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 ...

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 ...

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

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 ...

Vomiting can be caused by many things, most commonly gastroenteritis (the "stomach flu"). Vomiting (throwing up) can cause kids to lose fluids, salts, and minerals, so it's important to make sure ...

When people masturbate, they touch or rub their own genitals because they like the way it feels. This won’t stunt their growth (keep them from getting taller) or cause any health problems. You might ...

Walking pneumonia is a less serious form of the lung infection pneumonia. It's often caused by bacteria called Mycoplasma pneumoniae, but other bacteria or viruses can also cause it. Most kids with ...

Answering kids' questions about sex is a job many parents don’t look forward to. It may feel awkward when it comes to talking about puberty and where babies come from. But don’t avoid these topics.