At present, there is no food that can improve the intelligence of the fetus, and only moderate nutrition of the pregnant woman can ensure the normal growth of the brain function of the fetus. If the mother is malnourished, it may lead to the retardation of fetal mental development, but it should not be over-nourished. If the mother is over-nourished and her own body weight is too large, the metabolic requirements of the mother will prevail, and the supply to the fetus will no longer increase accordingly, therefore, only when the mother’s nutrition is balanced, it can ensure the ideal growth of the fetal brain function. However, there is no single food that can improve fetal intelligence. Because of the different nutritional requirements during different trimesters, early pregnancy requires adequate nutritional supplements, such as tasty diet, fruits, vegetables, and milk. Mid-pregnancy the fetus has basically differentiated, to meat and vegetables, more consumption of high-quality protein, but do not be too greasy. Late pregnancy to maintain the supply of protein, calcium and iron. The whole pregnancy should be more intake of food rich in iron and zinc.