Amino acid milk powder is also medically known as completely hydrolyzed protein milk powder, which is the hydrolysis of the important nutrient protein in milk powder into amino acids, so there is no allergenicity, and it is particularly suitable for children and patients with milk protein allergy, mainly for children with high milk protein allergy or multiple food allergy, severe allergy symptoms, especially involving multiple system allergy. For example, children with symptoms of digestive allergy such as diarrhea and indigestion, and skin symptoms such as recurrent eczema, and possibly respiratory symptoms such as frequent coughing and wheezing, are more suitable to use amino acid formula to treat and prevent symptoms of milk protein allergy. For mild milk protein allergy or single systemic milk protein allergy, deeply hydrolyzed protein milk powder is fine and there is no need to use amino acid milk powder.