Insufficient nutritional intake during pregnancy and insufficient or too slow weight gain of pregnant mothers will bring about adverse outcomes for both the mother and the fetus, as follows: 1. It is a common law in the mammalian world that when the mother’s nutritional intake is insufficient, the nutrient reserves within the mother’s body will be utilized to supply the fetus on a priority basis, and this tendency to sacrifice the mother to ensure the fetus has made the mother the greatest victim of under-nutrition. The mother will appear osteoporosis, iron deficiency anemia, hypoproteinemia, wasting, physical decline, low immunity and other malnutrition problems; 2, inadequate nutrition during pregnancy will also affect the normal development of fetal physical and intellectual development, the baby will be mentally retarded, maternity checkups found that the baby intrauterine growth retardation, less than the gestational age of the baby, and even miscarriage, premature birth, birth weight less than five pounds.