The demand for iron increases in the second half of pregnancy, and food supplementation alone is clearly inadequate. Proper iron supplementation for the mother-to-be is beneficial to the development of the fetus. Iron is one of the main raw materials for the body to produce red blood cells, and large amounts of iron are needed to make extra red blood cells during normal pregnancy. Iron deficiency anemia during pregnancy can lead to dizziness, weakness, panic and shortness of breath in the mother-to-be, as well as intrauterine hypoxia, growth retardation, impaired mental development and anemia in the fetus. Therefore, reasonable iron supplementation is needed during pregnancy. Commonly used iron supplements include ferrous sulfate, iron proteinate succinate and polysaccharide iron complex, etc. Pregnant women can apply iron supplements reasonably under the guidance of doctors.