Pregnant women who eat only coarse grains will cause fetal malnutrition, but if nutritionally balanced with other foods, will not cause fetal malnutrition phenomenon. Roughage is rich in dietary fiber, can relieve constipation during pregnancy, but also can provide energy for the mother and fetus, pregnant women need nutrients quality, only eat roughage, but do not pay attention to other nutritious food, will make the pregnant woman malnutrition, the fetus can not get enough nutrients from the mother, which will lead to the fetus malnutrition. Therefore, pregnant women should have a nutritionally balanced diet, eat coarse grains and at the same time pay attention to eating protein-rich foods and fresh fruits and vegetables, etc., take appropriate daily exercise and undergo regular maternity check-ups.