Second trimester
Learning Center
Sensitive teeth: What treatments are available?
Know what causes sensitive teeth and learn about effective treatments.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Sexually transmitted disease (STD) symptoms
Learn about symptoms of some of the more common diseases that can be passed through sex.
Shaken baby syndrome
Understand why shaking a baby can cause brain damage, and why getting immediate medical care can save a child’s life or prevent serious health problems.
Shigella infection
Shigella infection is an intestinal infection that causes diarrhea. Learn how to recognize, treat and prevent the spread of this contagious condition.
Sick baby? When to seek medical attention
Is it time to call your baby's doctor or seek emergency care? Follow these guidelines for treating a sick baby.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
Sickle cell anemia
Learn about the symptoms, causes and treatment of this inherited blood disorder that, in the United States, is more common among Black people.
Slide show: Breastfeeding positions
Breastfeeding can be awkward at first. Experiment with various positions until you feel comfortable.
Slide show: Common baby rashes
You might expect your baby's skin to be flawless, but baby rashes and other skin conditions are common. Find out when treatment is needed.
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