Iron deficiency anemia in infants mostly refers to pediatric iron deficiency anemia, which mostly occurs in infants aged 6 to 36 months, and may be caused by insufficient congenital iron stores, or insufficient intake due to improper addition of complementary foods later in life, or impaired iron absorption and excessive iron loss, which need to be analyzed in conjunction with the specific situation, and can be examined by a doctor if necessary. 1. Insufficient congenital iron stores: If the infant is a premature baby or a twin or multiple birth, the mother’s iron reserves through the The placenta gives the infant iron reserves may be congenitally insufficient, causing iron deficiency anemia in the infant. Or if the mother is a vegetarian or iron deficient during pregnancy, it may also cause insufficient iron reserves in the baby’s body, resulting in iron deficiency anemia; 2. Inappropriate addition of complementary foods: usually 4-6 months old babies should start to add complementary foods, if they are exclusively breastfed for too long, they may develop iron deficiency anemia due to insufficient nutritional intake if they do not add complementary foods after 6 months. Iron-deficiency anemia can be prevented by first adding iron-fortified rice flour to the infant and then gradually adding egg yolk to the infant; 3. Iron absorption disorders: If the infant has chronic diarrhea and other diseases that affect the absorption of iron in the gastrointestinal tract, it may cause the infant to develop iron-deficiency anemia. A small percentage of infants who have had surgery after birth, such as neonatal necrotizing small intestine colitis had surgery, can also affect the absorption of iron; 4, too much iron loss: such as the occurrence of intestinal parasitic infections, intestinal polyps, etc., can lead to a state of chronic blood loss in the intestine, which can also easily lead to infants suffering from iron deficiency anemia.