Nutritional iron deficiency anemia is mainly prone to occur in the following age groups: 1. 6 months-2 years: The proportion of men and women with iron deficiency anemia is basically the same in children aged 6 months-2 years because iron can be obtained from the mother during fetal period and iron deficiency is less likely to occur within 6 months after birth, but infants who do not take iron supplements after 4-5 months are prone to iron deficiency anemia because of their faster growth and higher iron demand. The clinical manifestations of ischemic anemia in infants are different from those in adults, usually manifesting as irritability, irritability, general weakness, crying, and even heterophagia, such as gnawing fingernails and eating clods. 2. Women of childbearing age: If women of childbearing age have increased menstruation or abnormal menstrual cycles, such as shortened menstrual cycles, resulting in increased iron loss in the body, some women of childbearing age are picky eaters, partial eaters, and do not like to eat Meat, or even dieting or weight loss for various reasons, resulting in insufficient iron intake and thus iron deficiency anemia. In addition, pregnant women are also prone to iron deficiency anemia in the last three months of pregnancy due to the increased iron demand of the fetus.