It is best for pregnant women to eat 3-5 walnuts a day. They should start eating walnuts when they are about 4 months pregnant. Walnuts have certain benefits for the brain development of the fetus and are beneficial to intelligence and brain health. Promote the development of fetal brain cells and make your baby smarter after birth. Eating too many walnuts can easily lead to indigestion, because walnuts are high-protein and high-fat foods. Eating too many walnuts can easily lead to obesity and weight gain for pregnant women, which can also affect the health of the fetus and affect the weight of the fetus. Excessive weight may lead to macrosomia, and pregnant women are prone to hyperlipidemia and high blood pressure during pregnancy. Therefore, during pregnancy, you should arrange your diet appropriately, avoid overeating, and maintain balanced nutrition.