How do I know if my teen is bipolar?

Teenagers are notorious for their mood swings -- but how do you know when they indicate a more serious problem? Watch Ask the Experts Ellen Leibenluft, MD, of the National Institute of Mental Health, explains telltale signs to watch for.

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Learn what the vaccine protects against, how it works, and when to speak with a healthcare provider.

Follow these tips to soothe your baby during—and after—these essential procedures.