The growth and development of the fetus requires abundant nutrients, therefore, pregnant women need to supplement sufficient nutrients in order to transmit them to the fetus through the placenta to ensure healthy fetal development. In addition to folic acid, the demand for other nutrients will also increase during pregnancy: 1. Calcium and vitamin D: If pregnant women have insufficient calcium intake, it may lead to symptoms such as twitching of their own limbs, and at the same time lead to delayed fetal bone development, so they need to supplement calcium with vitamin D, which can promote the development of fetal trunk and limb bones and avoid rickets, etc.; 2. Iron: After the fetus grows up, due to Therefore, the appropriate amount of iron supplementation during pregnancy can prevent the occurrence of iron deficiency anemia early, so as to avoid anemia leading to intrauterine hypoxia and growth retardation of the fetus; 3, zinc: zinc supplementation during pregnancy can improve the outcome of delivery, improve the active muscle tone and passive muscle tone of the newborn, reduce maternal and infant complications, and promote eugenics; 4, iodine: adequate iodine nutrition during pregnancy is the key to fetal neurological development. Therefore, if a pregnant woman is found to be iodine deficient after examination, appropriate supplementation can be made. Pregnancy is a special period, the nutrition of one pregnant woman to supply two people, so there may be a lack of certain substances, it is recommended to ensure a healthy and reasonable diet at the same time, the corresponding trace element examination, if the lack of relevant substances, in combination with dietary supplements, combined with drug supplementation, can reduce some maternal and infant diseases.