Preschoolers
Learning Center
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Iron deficiency in children: Prevention tips for parents
Learn how much of this key mineral your child needs and what the health risks of not getting enough are.
Video: Ovulation
Ovulation — the release of an egg from an ovary — occurs about midway through the menstrual cycle. See how it happens.
How your brain works
Which part of your brain does what? Take a tour.
Child sleep: Put preschool bedtime problems to rest
When a child has trouble sleeping, a gentle but firm bedtime routine is often the key to a good night's rest.
HER2-positive breast cancer: What is it?
HER2-positive breast cancer tends to be more aggressive than other types of breast cancer. Treatments that target HER2 are very effective.
Yeast infection in men: How can I tell if I have one?
Yeast infections can occur in men, causing inflammation of the penis (balanitis). Learn what signs and symptoms could mean you have a yeast infection.
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
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