Morning sickness is a thirst signal of both the fetus & the mother. During the intrauterine stage of cell expansion, water for the fetus' cell growth has to be provided by the mother. One of the first indicators for water needs of the fetus & the mother seems to be morning sickness during the first trimester of pregnancy. Water helps carry nutrients through blood to the baby. Water helps prevent bladder infections, constipation,and hemorrhoids, which are common during pregnancy. The more water you drink, the less water you retain. Dehydration can trigger contractions and early labor. Amniotic fluid (mostly water) is replaced continuously throughout the day, so more water is needed to replenish the body. Hydration is essential to good breast milk production. Not only is it important to drink enough water, the quality of the water consumed is of paramount concern. Many studies have shown that water contamination risks are greatly increased in infants, due to their size and stage of development, with their brains and bodies being formed.