Don't skip the mommy-to-be swim meet. Participating in pool exercises like aquarobics eases labor pain. Pregnant women who attend thrice-weekly water aerobics sessions request fewer painkilling meds during labor, possibly due to increased beta-endorphins.

Everyday plans like lunch dates and work obligations are easy to overlook, especially when overbooked. But being pregnant makes to-do lists even harder to check off. That's because remembering to remember is harder while baby bearing, and even for several months afterward. This may be nature's way of focusing new mothers on the arriving stranger. Mothers should rely on external reminders. Write notes to yourself and post them in obvious places. Set alarms if you need to. Your best intentions will be hard to carry out.

Obese and diabetic mothers produce fatter babies. Now there's evidence that a pregnant woman's McDonald's indulgences may cause her child to overeat later in life. Short-term exposure to high-fat diets in utero changes fetal brains in ways that heighten hunger. Mothers who consume a high-fat diet give birth to children who eat more, weigh more, and begin puberty earlier, thanks to an increase in appetite-stimulating neurons.

Listening to music regularly for at least half an hour a day can reduce stress, anxiety, and depression in pregnant women after just two weeks. If you crave a peaceful pre- and postnatal life, create a playlist of tunes with a tempo that matches your heart rate—between 60 and 80 beats per minute.

Preterm delivery is the leading cause of infant mortality and costs Americans $26 billion a year. Its causes are little understood, but researchers now know that depression in pregnant women dramatically escalates the probability of early delivery. The risk increases with the gravity of despair. Mood disorders interfere with neuroendocrine pathways, which influence placental function. So don't delay seeking treatment.