The cause of iron-deficiency anemia in children is due to the lack of iron stored in the body, resulting in decreased hemoglobin synthesis. It is a common disease that affects the health of children. The incidence is highest within 3 years old, and it is more common around 1 year old, but most of them are mild anemia. The main causes of iron deficiency anemia in children are: 1. Insufficient iron storage. Such as premature birth, twins, and mother’s anemia, will reduce the iron storage of newborns. 2, . Fast growth and development. From birth to 1 year old, babies grow and develop the fastest, their blood volume increases rapidly, and their iron needs are large. Therefore, children who grow too fast are prone to iron deficiency. 3. Iron deficiency in the diet. 6 months after the baby is born, the hematopoietic substances obtained from the mother are basically used up, and human milk and milk contain very little iron. Therefore, if supplementary food is not added in time, it is easy to be iron-deficient simply by feeding. 4. Illnesses such as chronic diarrhea, etc., cannot absorb iron well, resulting in iron deficiency. It takes a long time to discover the symptoms of anemia. Therefore, mild symptoms are often ignored. Generally, they are usually already moderate anemia when they are discovered. Common symptoms include restlessness or lack of energy, lack of activity, loss of appetite, pale skin and mucous membranes, and are most obvious in lips, nails, and palms. Older children can show symptoms such as dizziness, black eyes, inattention, and memory loss. Anemia affects the growth and development of children (including intellectual development), gastrointestinal function, and immune function. Therefore, prevention and treatment of anemia in children is very important.