Medically reviewed by: Tal Grunwald, MDThis link will open in a new window Learn About Endocrinology (Hormones & Growth) at Nemours Children's HealthThis link will open in a new window Puberty is the ...

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, ...

What Is the Endocrine System? The endocrine system is made up of glands that make hormones. Hormones are the body's chemical messengers. They carry information and instructions from one set of cells ...

What Is the Digestive System? Food is our fuel, and its nutrients give our bodies' cells the energy and substances they need to work. But before food can do that, it must be digested into small pieces ...

Most of a baby's brain development happens in the first 2 years of life. That's why it's so important for babies and toddlers to explore their environment and experience many sights, sounds, tastes, ...

Medically reviewed by: KidsHealth Medical ExpertsThis link will open in a new window Learn About Primary Care Pediatrics at Nemours Children's HealthThis link will open in a new window How do you ...

Medically reviewed by: KidsHealth Medical ExpertsThis link will open in a new window Learn About Primary Care Pediatrics at Nemours Children's HealthThis link will open in a new window Everybody knows ...

Medically reviewed by: Elana Pearl Ben-Joseph, MDThis link will open in a new window Learn About Primary Care Pediatrics at Nemours Children's HealthThis link will open in a new window "What's the ...

Medically reviewed by: Stephanie A. Deutsch, MDThis link will open in a new window Learn About the Children's Advocacy Center of Delaware at Nemours Children's HealthThis link will open in a new ...

What Is Rocky Mountain Spotted Fever? Rocky Mountain spotted fever (RMSF) is a bacterial infection. People get it from the bite of an infected tick. Most infections happen in spring and summer, when ...

Medically reviewed by: Rupal Christine Gupta, MDThis link will open in a new window Learn About Primary Care Pediatrics at Nemours Children's HealthThis link will open in a new window By helping kids ...

What Are Port-Wine Stains? A port-wine stain is a type of birthmark. It got its name because it looks like maroon wine was spilled or splashed on the skin. Though they often start out looking pink at ...