Generally, the symptoms of milk powder allergy in children can be determined from the following aspects: firstly, judging from the stool of children, milk powder allergy in children often causes an increase in the number of stools, the stool becomes diluted or even blood in the stool. Secondly, the weight gain of the child can be analyzed from the fact that the child’s weight does not increase for a long time or lags behind that of children of the same age after developing milk powder allergy. In addition, the skin symptoms of children can be analyzed. Some children with milk powder allergy will have increased eczema symptoms. If the IgE of milk protein is too high in the allergen test, the child can be diagnosed with milk powder allergy.