Many parents think that anemia is caused by malnutrition, but in fact, anemia is not a simple disease. Anemia can be divided into many kinds according to different classifications, the more common ones include nutritional anemia such as iron deficiency anemia and megaloblastic anemia, physiological anemia, hemolytic anemia such as hereditary spherocytosis and thalassemia, blood loss anemia such as trauma-induced blood loss, blood system diseases such as When children have anemia, they need to analyze the cause of the disease and give treatment for the cause. The more common ones are: 1. Iron deficiency anemia: it is the most common nutritional anemia, and if mild anemia is found, supplementary foods rich in iron can be added. Egg yolk, lean meat, animal liver, soybean products, and fungus are all iron-rich foods, while increasing the amount of milk drunk. Children with severe iron deficiency need to take ferrous sulfate or other iron preparations under the guidance of a doctor. 2. Infant physiological anemia: Due to the low oxygen-carrying capacity of fetal red blood cells and the relatively low-oxygen intrauterine environment, the number of red blood cells needs to be increased to ensure oxygen-carrying capacity. After birth, the red blood cells produced during the fetal period start to be destroyed, plus 3 months after birth is the fastest growing period for the child, the increase in blood volume is greater than the increase in red blood cell production, and the original red blood cell concentration is diluted, this normal physiological changes caused by the transient anemia state is called physiological anemia. Physiological anemia is a normal phenomenon that occurs during growth and development, so no treatment is needed and parents should not be nervous. 3 or 4 months later, the hemoglobin gradually regains its normal level. 3.Nutritional megaloblastic anemia: It is mostly seen in infants and children, especially within 2 years old, and is mainly caused by vitamin B12 or folic acid deficiency. Anemia may sound simple, but the clinical diagnosis process is sometimes very complicated, and sometimes many laboratory tests are needed to make a clear diagnosis. Regardless of the type of anemia, parents should not treat it on their own with subjective judgment, but should ask the doctor to identify the exact cause of the anemia before taking targeted treatment to avoid wrong treatment or delayed treatment.