If children are allergic to proteins, drinking breast milk can also cause allergic symptoms because breast milk also contains proteins, which belongs to the allergic body, and applying proteins to children can cause allergic symptoms, such as eczema and diarrhea, and some children grow up with bronchial asthma and other symptoms. When children have protein allergy, they should apply deeply hydrolyzed milk powder or directly apply amino acid milk powder, because deeply hydrolyzed milk powder will decompose proteins, which can effectively avoid the occurrence of allergic symptoms, and amino acid milk powder is even more so.