Second trimester
Learning Center
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.
Snoring
Is the sound of snoring disrupting sleep in your household? Find out causes and treatment options for this common problem.
Solid foods: How to get your baby started
Follow these tips for starting your baby on solid foods.
Spider bites
Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.
Spina bifida
Learn about this condition in which an unborn baby's spine and spinal cord don't form properly. Surgery during pregnancy may be a treatment option.
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Strep throat in young children: A common diagnosis?
Strep throat in young children is uncommon, but it's possible. Learn about symptoms.
Stye (sty)
A stye (sty) is a painful red bump along the eyelash line that can often be treated with home remedies. Find out more about this irritating eyelid infection.
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