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Pericarditis is inflammation or infection of the pericardium. In children, pericarditis is most likely to happen after surgery to repair heart defects.

Syncope is a brief loss of consciousness and muscle tone caused when not enough blood gets to the brain. Syncope is commonly called fainting. In most children, it’s usually harmless. But in a few children, syncope is serious. This is usually because of a heart problem, or less often a neurological problem.

Flat head syndrome (deformational plagiocephaly) is when a baby's head develops a lasting flat spot. The flat spot may be either on one side of the head or on the back of the head. This happens when a baby sleeps in the same position most of the time or because of problems with the neck muscles.

Read on to learn about the common developmental milestones for babies ages 10 to 12 months.

A helpful look at common developmental milestones in young babies.

This age is very social, and babies begin moving in much more purposeful ways.

Read on to learn about common physical, speech, and other developmental milestones to expect when your baby is this age.

A helpful look at age-appropriate hearing milestones for babies and toddlers.

The teen years are a time of growth spurts, puberty changes, and emotional and social development. Here's what you need to know.