Worries and pregnancy seem to go hand in hand. Fortunately, however, most women of childbearing age are healthy and most pregnancies are considered "low-risk." For most women, the surest way to have a healthy baby is to live a healthy lifestyle. The March of Dimes suggests the following precautions: Get early prenatal care, even before you're pregnant. Eat a well-balanced diet, including a vitamin supplement that contains folic acid. Exercise regularly with your doctor's permission. Avoid alcohol, cigarettes, and illicit drugs, and limit caffeine. Avoid x-rays, hot tubs, and saunas. Avoid infections. Getting Good Care for best baby When it comes to medical care and pregnancy, you can never start too early. "The best start to having a healthy baby is to see your health-care provider before you conceive," says Richard Schwarz, M.D., an obstetrician and national consultant for the March of Dimes. "There are lots of things you can do ahead of time....