Babies are still young and their body functions are not well developed, so they are easily stimulated by the external environment and cause discomfort. Babies consume allergy-prone food, improper use of skin care products, ultraviolet radiation, or saliva or sweat not wiped in time can cause allergies in babies. The baby has skin allergy, which will appear as eczema, wind clumps, hives, etc., manifested as red, dry, itchy, blotchy skin surface, swollen eyes, peeling skin or dark sores, red eyebrows when crying, and the child has blue eyes. Allergy to the conjunctiva of the eyes, manifested as allergic conjunctivitis, the baby will often rub the eyes or wipe the forehead on the body or clothes of adults, often teary-eyed, once out of the house a wind will flow tears, serious even cause nasolacrimal duct blockage. Nasal mucous membrane allergy is manifested by frequent nose rubbing, nostril picking, sneezing and even runny nose. It can also cause digestive symptoms such as diarrhea, constipation and even blood in the stool, and some children may have alternating diarrhea and constipation. Other babies develop respiratory symptoms, such as wheezing, enlarged tonsils, enlarged adenoids, and asthma. For baby allergies, the first step is to find out the cause of the allergy and stay away from it. It should also be combined with the baby allergy symptoms, targeted treatment to relieve the baby discomfort.