Down syndrome Down syndrome affects your baby's learning and development, and presents some physical problems. What causes Down syndrome and how can you test for it?
Pregnancy after age 35 If you get pregnant after 35, you may need prenatal tests to check for birth defects. Learn about pregnancy after 35.
Smoking during pregnancy Smoking during pregnancy can cause problems like premature birth and birth defects. If you need help to quit smoking, tell your health care provider.