Allergies are inherited and are unchangeable. However, the characteristics of allergic reactions are different for different people, such as milk protein allergy, which also varies from person to person. From the clinical manifestation of allergy in pediatrics, it is generally reflected in two major aspects: 1. Mainly skin allergy, some children will show chronic, recurrent and persistent eczema, which is a more common type of allergic reaction. There are also children with chronic urticaria and unexplained itchy skin, which are three of the more common skin allergic reactions in pediatrics; 2. Milk protein allergy is more often reflected in the gastrointestinal tract, the most common in the digestive tract is chronic diarrhea, children with perennial diarrhea, regardless of the use of various methods are difficult to heal. In addition, some children have long-term bloating, the stomach itself is very flatulent, the child will have all kinds of discomfort, always crying. In addition, what is most easily overlooked is that this child does not gain weight for a long time and has a relatively poor nutritional status, which may also be a clinical feature of milk protein allergy.