The decision of when to take iron supplements during pregnancy depends on whether the pregnant woman is iron deficient or not. Adequate iron levels can be maintained in the body through meals since the beginning of pregnancy. However, if iron deficiency anemia is diagnosed through routine blood tests during the pregnancy test, it is necessary to start strengthening iron supplementation. Iron is one of the main raw materials for the production of red blood cells in the human body, and a serious iron deficiency in pregnant women can lead to iron deficiency anemia, which will not only cause dizziness, fatigue, panic, and shortness of breath due to anemia, but also lead to intrauterine hypoxia and growth retardation in the fetus. For pregnant women with good nutritional status and adequate dietary iron sources, normal iron can be maintained through diet in daily life. It is recommended that pregnant women eat more iron-rich foods, usually the darker the color of the food the higher the iron content, and one of the red animal food in the iron is most easily absorbed by the human body, such as red meat, animal liver, lean meat, pig’s blood is rich in iron, vegetables, such as spinach, oilseed rape, celery, and so on, and at the same time, nuts, dried apricots are rich in iron. By the middle and late stages of pregnancy, the increase in blood volume of the whole body of pregnant women reaches its peak, which can cause dilutional anemia. Do not blindly take iron supplements, to clarify whether the iron deficiency anemia, confirmed diagnosis before taking iron under the guidance of the doctor to correct anemia.