The harm of anemia in children is great, mainly manifested in general weakness, fatigue, dizziness, excitability, irritability, poor appetite, inattention, decreased academic performance, pallor, easy to catch a cold, and long-term anemia will also affect the development of intelligence and physique. Anemia in children not only affects children's intellectual development, but also affects children's physical quality. When hemoglobin is lower than the normal level, anorexia, weight loss, gastrointestinal malabsorption and other symptoms may occur.