It is recommended to take iron supplements after meals during pregnancy. As iron supplementation usually stimulates the mucous membrane of the gastrointestinal tract, it may cause nausea or vomiting if the pregnant woman has a poor gastrointestinal condition. It is recommended to take iron supplements at intervals after meals to avoid discomfort caused by stimulation of the gastrointestinal mucosa, or with meals if the pregnancy reaction is severe. Pregnant women are at high risk of iron deficiency anemia, and iron supplementation during pregnancy is also to give the fetus iron reserves, but iron supplementation during pregnancy should not be taken blindly, as some iron supplements have obvious side effects, such as diarrhea and abdominal pain, so iron supplements should not be taken blindly, and iron supplements with fewer side effects should be chosen according to medical advice and taken regularly and quantitatively. During the period of iron supplementation, you can take vitamin C to promote iron absorption. In addition to iron supplements, pregnant women can also consider enhancing iron intake from food. 20-50g of red meat can be added daily in the middle of pregnancy, and animal offal can be eaten 1-2 times a week. Tea and coffee can affect the absorption of iron and are recommended not to be consumed during iron supplementation. In addition, taking iron supplements can make the stool black, not upper gastrointestinal bleeding, and pregnant women should pay attention to identify it. Periodic rechecking of hemoglobin is required during the period of taking iron supplements. After the hemoglobin rises to the normal range, it is usually required to continue supplementation for 1-2 months, i.e. a total course of 3 months or even more, in order to maintain effective hemoglobin concentration.