Preschoolers
Learning Center
Bump on the head: When is it a serious head injury?
Even a minor injury to the scalp or forehead can cause a large lump. Find out when it's time to see a healthcare professional.
Bulging disk vs. herniated disk: What's the difference?
Compared with a bulging disk, a herniated disk is more likely to cause pain because it protrudes farther and is more likely to compress nerve roots.
Blood pressure: Is it affected by cold weather?
Blood pressure generally is higher in the winter than in the summer. Discover why.
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
Barrel chest: What causes it?
Barrel chest isn't a disease, but it may indicate an underlying condition, such as chronic obstructive pulmonary disease (COPD).
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Baby sunscreen: What's recommended?
Understand when it's safe for a baby to wear sunscreen.
Baby sling: Is it safe?
Follow these safety tips for using a baby sling.
Baby poop: What's normal?
Baby poop comes in various colors and textures. Know what to expect in your newborn's diapers.
Avulsion fracture: How is it treated?
Surgery is rarely needed to reattach a small chunk of bone when it gets pulled away from the main part of the bone by a tendon or ligament.
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