During pregnancy, pregnant women usually need to supplement a variety of nutrients, which include folic acid, calcium and iron, and high-quality protein. Folic acid belongs to the nutrients that need to be supplemented in the early stage of pregnancy, and it can be taken as prescribed by the doctor during the preparatory period and the early stage of pregnancy, which is conducive to the development of the fetus’s nervous system. From the perspective of eugenics, it is necessary to supplement folic acid in advance. For women in mid-pregnancy, they also need to supplement calcium and iron with a balanced diet. This is an important micronutrient, and a large amount of calcium supplementation is needed during pregnancy because of the increased demand. Iron, on the other hand, promotes the production of hemoglobin, so it is also important to have an adequate iron component. Not only that, pregnant women in the stage of pregnancy, but also need to supplement a large number of high-quality protein components, only balanced nutrition, in order to ensure their own health and the growth and development of the fetus.