First trimester
Learning Center
Stages of labor and birth: Baby, it's time!
Find out what happens during the different stages of labor and birth.
Spinal cord tumor
Spinal cord tumors can cause serious problems such as pain and paralysis. Find out how more about management and treatment.
Spermicide
Learn how to use this type of birth control that prevents pregnancy by killing or immobilizing sperm so that the sperm can't fertilize an egg.
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
Spastic colon: What does it mean?
This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how accurate is it?
Small bowel prolapse (enterocele)
Learn more about this condition also called a vaginal hernia that happens when the small bowel pushes down onto the top of the vagina.
Slide show: Vaginal tears in childbirth
Vaginal tears during childbirth are common. See illustrations of various degrees of vaginal tears and treatment tips.
Slide show: Pregnancy stretches
Know how to relieve aches and pains as your pregnancy progresses.
Slide show: Labor positions
Consider positions that might help you relax and ease pain during labor.
Slide show: How your brain works
Which part of your brain does what? Take a tour with this slide show.
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