Baby protein allergy symptoms can be manifested as gastrointestinal symptoms, respiratory symptoms, skin allergy symptoms, such as nausea, diarrhea, asthma, rashes, and so on, and in severe cases, anaphylactic shock can occur. 1. Gastrointestinal symptoms: baby protein allergy can appear refused to drink milk, crying, may be accompanied by nausea, vomiting, abdominal pain, diarrhea, abdominal distension and other gastrointestinal symptoms, a small number of may also appear to solve the blood stool or vomiting blood. 2. Respiratory symptoms: some babies will have asthma or allergic rhinitis and other respiratory symptoms, and a small number may cause otitis media. 3. Skin allergy symptoms: Most protein-allergic babies will also have skin allergy symptoms such as atopic dermatitis or urticaria. 4. Anaphylactic shock: Anaphylactic shock is the most serious symptom of protein allergy in babies, which may include runny nose, pale face, etc., followed by a state of shock. When your baby shows symptoms of protein allergy, you should seek medical attention in time and under the guidance of your doctor.