Children with iron deficiency will have symptoms such as pale yellow color, loss of appetite, nausea and vomiting, apathy, and susceptibility to infection. 1. Yellowish color: Iron deficiency will lead to hematopoietic dysfunction, iron is the raw material for the synthesis of red blood cells, and iron deficiency will lead to a decrease in the number of red blood cells, which will lead to the symptoms of yellowish color in children. 2. Loss of appetite, nausea and vomiting: loss of appetite, nausea and vomiting are symptoms of the digestive system in children with iron deficiency. 3. Indifference: Iron-deficient children may have a lack of concentration and indifference in the nervous system. 4. Susceptibility to infections: Iron deficiency can lead to iron deficiency anemia, which affects the immune function of the cells, so there may be susceptibility to infections.