Anemia is a common clinical condition in which the number of red blood cells in human peripheral blood is reduced below the lower limit of the normal range. Due to the complexity of red blood cell volume determination, hemoglobin (Hb) concentration is often used as a clinical substitute.The diagnostic criteria established by WHO consider anemia to be diagnosed at sea level when Hb is less than the following levels: 110 g/L for children 6 months to 6 years of age and 120 g/L for children 6-14 years of age. Anemia is broadly classified into: hemolytic anemia, i.e., an anemia of excessive red blood cell destruction; anemia of hemorrhagic loss; and an anemia of reduced erythropoiesis, which includes other hematologic disorders such as nutritional anemia and aplastic anemia. Reduced anemia, including nutritional anemia, aplastic anemia and other blood system diseases. Anemia in children should be treated specifically according to the different causes, and blood transfusion is necessary for severe cases. The principle of treatment for iron deficiency anemia is to eliminate the cause of the disease and take iron supplements. Oral iron is the most effective, least side-effective and most economical treatment. Oral intake between meals is recommended, and oral vitamin C is also recommended to promote absorption. Elemental iron dosage is 2mg-6mg/kg per day, divided into 3 times, each time <1.5mg-2mg/kg; or small-dose, intermittent iron supplementation (1mg/kg per day or once a week), and the specific treatments should be carried out in accordance with the doctor's instructions. In daily life, you can choose to eat animal liver, such as pig liver, sheep liver, etc. Animal liver has the highest iron content, so liver is the first choice of food for iron-deficient babies, followed by foods with high iron content that are easy to digest and ingest, such as: pig's blood, chicken blood, duck's blood and other animal blood. Children can also take ingredients that contain a lot of iron, such as black beans, black fungus, nori, eggplant, spinach, and so on. Treatment of anemia varies for different causes. The more common type of anemia in children is iron-deficiency anemia, which can be improved by iron supplements and dietary increases in iron-containing foods.