If a child shows signs of iron deficiency anemia, he or she needs to be treated with oral iron supplements. Clinically, ferrous iron preparations are often used for oral iron supplementation to facilitate the absorption of iron, mostly ferrous sulfate. Generally, the dose of iron supplementation is calculated according to elemental iron, 2-6mg per kg body weight per day, taken between meals and 2-3 times a day, will achieve good results of iron supplementation. Also take vitamin C orally, which will promote the absorption of iron. Continue iron supplementation for two months after hemoglobin normalization to restore the level of iron stored in the body. If necessary, other vitamins and trace elements, such as folic acid and vitamin B12, can be supplemented at the same time. Intermittent iron supplementation of 1-2mg per kg body weight each time, 1-2 times a week or once a day, can also achieve the effect of iron supplementation, and the course of treatment is usually 2-3 months.