Infant formula allergy may appear digestive manifestations, respiratory manifestations, skin manifestations, and other manifestations, such as diarrhea, cough, rash, and sleep disturbance. 1 digestive tract manifestations: if the infant is allergic to milk powder, after drinking milk powder may appear diarrhea, abdominal pain, abdominal distension, nausea and vomiting, constipation and other digestive tract discomforts. 2. Respiratory manifestations: if the baby is allergic to milk powder, it is easy to appear respiratory discomfort after drinking milk powder, such as frequent coughing, wheezing, runny nose, breathing difficulties, and so on. 3. Skin manifestations: some infants drinking milk powder allergy will also appear hives, eczema, can be manifested as skin pimples, itching, stinging, swelling of the lips and so on. 4. Other manifestations: infants allergic to milk powder will also manifest as sleep disturbance, crying, refusing milk. Some patients may also have symptoms of anaphylactic shock such as cyanosis around the mouth, loss of consciousness, cold sweat and pallor in severe cases. If the baby cries and rashes when drinking milk powder, it should be alerted to the allergy to milk powder. It is worth noting that we should avoid giving babies milk powder that is easy to cause allergies, and for babies who have severe allergic reactions after drinking milk powder, we need to send them to the doctor in time.