A 6 month old baby with hemoglobin 109g/L is considered anemic. For 6 to 59 months, anemia is diagnosed when hemoglobin is less than 110g/L. 90 to 110g/L is considered mild anemia. 6 months old babies with hemoglobin 109g/L are diagnosed with mild anemia, and the common cause is nutritional anemia, in addition to hematopoietic dysfunction, infections, and inflammation can also lead to anemia. Nutritional anemia includes iron deficiency anemia and megaloblastic anemia. Iron deficiency anemia is the anemia caused by the lack of iron in the body, which leads to the reduction of hemoglobin synthesis, manifested as small cell hypochromic anemia, which can be treated by timely iron supplementation; megaloblastic anemia is the large cell anemia caused by the lack of vitamin B₁₂ or folic acid, which can be treated by supplementation of folic acid, vitamin B₂₂, etc. In addition, aplastic anemia, simplex anemia and anemia of the blood, which can also be caused by infections and inflammation, are also nutritional anemia. In addition, aplastic anemia, simple red blood cell aplastic anemia, Haemophilus influenzae, Staphylococcus aureus, streptococcus and other infections, anemia due to chronic kidney disease, anemia due to lead poisoning, cancer anemia and so on can also lead to anemia. Newborns with decreased hemoglobin should go to the hospital in a timely manner to identify the cause of the disease and then undergo targeted treatment.