Baby’s complementary food allergy may present skin symptoms, digestive system symptoms, respiratory system symptoms, such as skin erythema, diarrhea, sneezing and so on. 1. Skin symptoms: When babies are allergic to complementary foods, skin symptoms may appear first. Such as itching, redness and swelling of the skin, some babies may develop skin erythema and pimples, which may lead to skin ulceration and exudate when the symptoms are severe. 2. Digestive symptoms: Some babies allergic to complementary foods may develop digestive symptoms, resulting in nausea, bloating, vomiting, diarrhea or constipation. Some children may have abdominal pain after the allergy. 3. Respiratory symptoms: babies with allergies may also activate the respiratory allergic reaction, some babies will sneeze, runny nose, nasal congestion and breathing difficulties and other symptoms. Babies consuming complementary food allergies should go to the hospital in time for treatment, identify allergens and avoid contact with allergens.