Anemia in 1-month-old babies may be caused by congenital, acquired and physiological reasons, which can be supplemented with nutrition, medication, blood transfusion, transplantation of hematopoietic stem cells and so on. 1. congenital factors: such as genetically caused hemolytic anemia, thalassemia, hemophilia, etc., generally need to supplement folic acid, blood transfusion, iron supplementation therapy, hematopoietic stem cell transplantation, and splenectomy. 2. Acquired factors: iron deficiency anemia caused by lack of nutrition, nutritional megaloblastic anemia; immune thrombocytopenia caused by immunity after viral infection. Generally, it is necessary to give the baby enough nutrition, iron supplements, vitamin B12, folic acid and other medications, transfusion of red blood cells, hematopoietic stem cell transplantation and so on. At the same time, it is necessary to prevent infections, digestive disorders and other complications. 3. Physiological anemia: physiological anemia of full-term infants appears 2~3 months after birth, and physiological anemia of preterm infants is earlier than that of full-term infants. Physiological anemia is a self-limiting disease, generally no treatment is needed, and can be gradually recovered after 2~3 months. It is recommended that babies with anemia consult a doctor in time to find out the cause and get early treatment. All of the above medications should be used under the guidance of a doctor.