Iron deficiency is by far the most common nutritional deficiency, and about nearly half of the children in China have iron deficiency. Iron deficiency is a state in which the total iron content of the body is reduced, and includes three stages of development: the iron-reduced stage, the iron-deficient stage of erythropoiesis, and iron-deficiency anemia. Even a mild iron deficiency that has not yet progressed to the anemia stage can already cause irreversible damage to a child’s cognitive, learning, and behavioral development. Iron deficiency anemia often occurs in children between the ages of 6 months and 3 years, and symptoms include irritability, lethargy, decreased voluntary activity, and disinterest in their surroundings. Although children’s motor skills may return to normal after nutritional treatment, adverse effects on emotion, cognition and attention may remain. Iron deficiency hazards: 1, iron deficiency anemia infants with reduced neurointelligence and psychomotor scores: iron deficiency before the anemia has been significantly impaired, iron supplements, can not be fully corrected. 2, iron deficiency on infant social-emotional behavior have adverse effects: mothers and infants anemia caused by emotional indifference and mutual influence. 3, Infantile iron deficiency on cognitive ability of the long-term continuation of the impact. 4, early iron deficiency and anemia damage is difficult to compensate. Liver, animal blood, beef, and lean meat are rich in iron and are the best sources of dietary iron. The total iron content of fish and eggs is lower than that of meat, but still better than plant foods. Fresh green leafy vegetables contain high iron content and are rich in vitamin C, which promotes iron absorption and can be used as a supplementary source of iron. The iron content of dried jujube is 1.84mg/100g, and the iron of jujube is absorbed by the human body utilization rate is also very low, not as good as the effect of red meat. The effect of iron supplementation of red dates is far less than that of pig liver and red meat.