Marfan syndrome Marfan syndrome is a birth defect that affects the body's connective tissue. Learn the signs and symptoms of Marfan syndrome and how it's treated.
Rh disease RH factor is a protein on some people's red blood cells. Learn how RH disease affects your baby and how to prevent it.
Why at least 39 weeks is best for your baby If your pregnancy is healthy, it’s best to stay pregnant for at least 39 weeks. Wait for labor to begin on its own.