An allergy is considered to occur when the body’s immune system reacts abnormally to certain normal substances from the air, water, contact or food; whereas most normal people do not react abnormally when exposed to these substances. In recent years, the occurrence of allergies has become more and more serious and has far exceeded our imagination. The manifestations of allergy are complex and diverse, and can be manifested as skin symptoms (eczema, urticaria; angioneurotic edema; vasculitis; contact dermatitis; drug-induced rash, etc.), as well as gastrointestinal symptoms (nausea, vomiting, diarrhea, constipation, abdominal pain, gastritis, enteritis, etc.), respiratory symptoms (rhinitis, bronchitis, asthma, chronic cough, etc.), and other systemic symptoms, some of which are very insidious. Some symptoms are very insidious, so allergies are very harmful and seriously affect the quality of a person’s life, but at present it is difficult to treat allergies, so the prevention and early intervention of allergies is of great importance. So how to carry out prevention and early intervention? 1, pregnancy health care: adhere to a diverse diet during pregnancy, pregnant women adhere to exercise, outdoor activities, to ensure the supply of micronutrients such as calcium and vitamin D for the fetus. Do not smoke and reduce the chance of inhaling second-hand smoke. 2, perinatal intervention: strive for normal delivery, breastfeeding as early as possible after birth, try to exclusively breastfeed, if there is no breast milk to feed when the milk is opened after birth, it is recommended to give allergy-preventing powdered formula instead. 3. Lactating mothers should observe the foods and behaviors (such as smoking, skin care products, hair dyeing) and conditions (such as poor sleep, stressful work and emotional instability) that are related to infant allergies. If allergies are found during the feeding process, it is recommended to consult a doctor promptly. 4. Reasonable addition of complementary foods: The addition of complementary foods for children with a family history of allergy or eczema or food allergy should start after 5-6 months of age, and it is not advisable to introduce allergy-prone foods too early, and the addition of complementary foods should start with rice flour, fruit juice, fruit puree, vegetable juice and vegetable puree. When adding new foods, introduce the same food for 5-7 days, and observe the infant’s reaction to the food, if no abnormalities occur, other new foods can be introduced. Prevention of infectious diseases: Infections, whether viral or other pathogens, can trigger allergic rhinitis, asthma or other allergic diseases, so it is very important to strengthen exercise, reasonable feeding and intensive care to avoid the occurrence of infectious diseases to prevent allergies. In addition, when infection occurs, antibiotics and other drugs should be applied reasonably. 6. Care issues: Babies with a family history of allergies or those who have developed allergies should be kept in an environment that is as cool as possible, especially in summer or during the heating season. Avoid strong direct sunlight on the skin, take care that the water temperature of bathing is lower than normal, and try not to apply non-natural bathing and skin care products. In short, once allergic diseases occur, they can cause many problems that parents are not expecting. Therefore, early prevention is important, and once allergies are detected, early intervention should be done under the guidance of a doctor, including the application of certain medications and certain special treatment measures.