1. What is iron deficiency anemia in infants? Iron deficiency anemia in infants refers to a disease in which insufficient iron intake or malabsorption leads to insufficient iron reserves in the body, which in turn affects the normal production and function of red blood cells, leading to anemia. This disease is common in children between 6 months and 3 years old, especially babies between 6 months and 1 year old. 2. Why do babies need iron supplements? Iron is one of the essential elements that make up human hemoglobin and myoglobin and can help transport oxygen throughout the body.