1.According to the World Health Organization’s diagnostic criteria for anemia: Children 6 months~＜5 years old, hemoglobin＜110g/L, are considered anemic. From 5 years old to 11 years old, hemoglobin <115g/L is considered anemia. 12 years old-14 years old, hemoglobin <120g/L, is anemia. 2. Our Pediatric Blood Conference (1998) recommended that: In the neonatal period, hemoglobin <145g/L is considered anemia. January-April, hemoglobin <90g/L, as anemia. From April to June, hemoglobin <100g/L is anemia. 3.Grading of mild anemia in children: Mild anemia: Hemoglobin < lower limit of normal ~90g/L. Moderate anemia: Hemoglobin <90g/L-60g/L. Severe anemia: Hemoglobin <60g/L-30g/L. Very severe anemia: Hemoglobin <30g/L. 4.Grading of mild anemia in newborns Mild anemia: hemoglobin 120g/L-144g/L. Moderate anemia: hemoglobin <120g/L-90g/L. Severe anemia: hemoglobin <90g/L-60g/L. Very severe anemia: hemoglobin <60g/L.