Allergies to complementary foods have the following symptoms: 1. digestive system symptoms, because children’s digestive system is not well developed, can not digest the food eaten, so there will be bloating, nausea, vomiting, constipation, stomach pain and other symptoms. 2. skin allergy symptoms, if the allergy is light will appear dry skin, itching and other symptoms, if the allergy is more serious may induce eczema, rash, hives and other skin diseases. 3. 3, respiratory problems, allergies to complementary foods will have a cough, runny nose, nasal congestion, runny eyes, shortness of breath, sneezing and other symptoms, because these symptoms are similar to the symptoms of the cold, many parents will be treated as a cold, so it will lead to the child’s allergy symptoms aggravated. 4, throat and oral symptoms, the mouth and throat are the first to contact with complementary foods, if allergic to complementary foods mouth and throat will have swelling, itching and other symptoms. Symptoms, some patients will have edema of the lips.