Determination of baby milk protein allergy is mainly diagnosed by symptoms, laboratory tests, and food excitation tests. 1. Symptoms: Hives, angioneurotic edema, cough, wheezing, abdominal pain, nausea, vomiting and other symptoms appear after the baby comes into contact with foods such as eggs, milk, peanuts, nuts, shellfish, soybeans, wheat, etc. They may occur within a short time of exposure to the above foods, or they may occur within weeks and months of exposure. Symptoms disappear after avoiding ingestion of the food. 2. Laboratory tests: Positive skin prick test indicates the presence of specific IgE antibodies, but it is not only used as a diagnostic basis for milk protein allergy; the detection of allergenic fractions is of great significance in the diagnosis and treatment of allergic diseases, and it can also predict the risk of food allergy and severe allergic reactions; the eosinophil activation test is also used in the diagnosis of food allergy. 3. Food stimulation test: It is a specific diagnostic method to diagnose food allergy after the baby avoids allergenic food and the symptoms get better, and then ingests the allergenic food again to induce the allergic symptoms, so as to clarify the food allergy. It is currently the gold standard for diagnosing milk protein allergy. Whether your baby is allergic to cow’s milk protein should be assessed by a doctor, do not use medication on your own.