The third trimester of pregnancy falls between early and mid-pregnancy, and folic acid and iron supplements can be taken during this period under the guidance of the clinician. 1. Iron: Iron deficiency may lead to iron deficiency anemia in pregnant women, resulting in poor fetal development and other adverse outcomes, you can choose to increase the intake of iron-rich foods, such as animal blood, liver, lean meat, etc., a clear diagnosis of the existence of iron-deficiency anemia, you can consume an appropriate amount of iron-fortified foods or a small dose of iron, such as ferrous succinate, and so on. 2. Folic acid: Lack of folic acid in the body may lead to neural tube malformations, preterm labor and other hazards. It is recommended that you start taking folic acid-rich liver, dark green vegetables and beans from the beginning of your pregnancy. Since folic acid supplements are more easily absorbed, it is recommended to take regular daily folic acid supplements after conception and throughout the pregnancy. Under normal circumstances, a woman during pregnancy can supplement her diet with a variety of substances through a balanced intake of various types of food. If it is clear that there is a deficiency of certain substances, under the guidance of the clinician, targeted drug supplementation can be carried out, and should not be used blindly.