Second trimester
Learning Center
Strep throat in young children: A common diagnosis?
Strep throat in young children is uncommon, but it's possible. Learn about symptoms.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Stool DNA test
Learn about this noninvasive colon cancer screening test that can detect DNA changes in cells collected from a stool sample.
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
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.
Spider bites
Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.
Solid foods: How to get your baby started
Follow these tips for starting your baby on solid foods.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
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.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
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