Doctors recommend that during pregnancy you drink eight eight- to 12-ounce glasses of water a day. Dr. Fuhrman points out that "80 ounces of water is an appropriate goal to strive for, but [if you eat a healthy diet] 40 ounces of water will be sufficient because you will be getting lots of water from high-water content produce such as fruits, vegetable soups, and stews." Dr. Furhman points out that the American diet can be sodium-heavy and suggests focusing on water-rich foods to reach your recommended daily dose of H2O.
Water in Pregnancy"Typically, your body is composed of about five liters of water," says Dr. Mira Aubuchon, MD, an assistant professor in the Department of Obstetrics and Gynecology at the University of Cincinnati College of Medicine. "During your pregnancy that typically goes up to at least six liters. Most of the increase is from blood volume—blood is composed mostly of water."
Increased blood volume carries nutrients to your developing baby and then whisks waste out. Your body will naturally retain more fluid to adequately supply your blood—and as your baby grows, to replenish amniotic fluid, explains Dr. Aubuchon. And according to Pregnancy, Childbirth, and the Newborn: The Complete Guide, by Penny Simkin, "Toward the end of the pregnancy, your baby is immersed in about one quart of amniotic fluid, which is replaced every three hours."