It's not clear what causes multiple sclerosis (MS), an immune disorder that is typically diagnosed between ages 20 to 40. But researchers are seeking more clues.

Almost one third of women of childbearing age are obese, which may affect the development of the unborn baby as well as the mother's long-term heart health.

The vast majority of pregnancies are uncomplicated, with healthy moms and healthy babies. But one of the more common pregnancy complications when one occurs is pre-eclampsia.

Women have all sorts of decisions to make about their behavior during the months that they are pregnant. Some of their decisions can boost the likelihood of a healthier pregnancy.

A woman's weight before she becomes pregnant can contribute to how her pregnancy plays out, regardless of how much weight she gains while pregnant.

Being overweight and pregnant has previously been shown to increase risks during delivery — but there may be more to the story than just a woman's weight that influences her risks.

Nearly all women gain weight during their pregnancy. This is normal and expected since they're growing a little human inside. But gaining too much or too little can present risks.

The invention of in vitro fertilization (IVF) has allowed many couples to become parents when it  might not otherwise have been possible. But different factors can influence how well IVF works.

Part of being pregnant is gaining weight. Women who already carry extra pounds before getting pregnant, though, might face more risks than women who don't.

It's well understood that women should not smoke while pregnant. Yet some women find it difficult to quit. Knowing some of the long-term effects may offer an extra motivational boost.