The first trimester of pregnancy can be beneficial to the development of the fetus by supplementing folic acid, iron supplementation and reasonable nutritional diet. 1. Supplementary folic acid: folic acid is an essential vitamin in the body, which is crucial for fetal neural tube development, so pregnant women need to supplement folic acid for fetal intake under the guidance of a doctor, and it is recommended that sufficient folic acid be supplemented during the third trimester of pregnancy in order to prevent cerebral vascular malformations in the fetus. 2. Iron supplement: because the fetal nutrients are all supplied by the mother, so pregnant women need to pay attention to iron supplementation, iron is mainly involved in the body’s hemoglobin synthesis, to avoid anemia due to the increase in circulating blood and the relative insufficiency of iron content, we should eat more food containing iron, such as animal liver, lean meat and so on. 3. Dietary nutrition is reasonable: pregnant women during pregnancy to eat more protein-rich foods, such as eggs, pork lean meat, soy products, milk and so on. Also need to appropriate supplement shrimp, fish, pork liver, oats, walnuts, peanuts and other foods, eat more fresh vegetables and fruits, to ensure that the intake of food nutritionally balanced, to avoid a single nutrition. The first trimester of pregnancy should go to the hospital on time to do the pregnancy checkups, through the examination to understand their own and fetal status, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.