Allergy in newborns refers to an overly strong reaction of the own immune system stimulated by a foreign antigenic substance, which is a manifestation of the body’s stress mechanism. Symptoms include allergic rhinitis, allergic cough, skin rashes, digestive symptoms and anaphylaxis. 1. Allergic rhinitis: manifested as a runny nose, itchy nose, newborns rubbing the nose or sniffing, breathing sounds become louder. 2. Allergic cough: manifested as involuntary cough, you can observe whether there are flowers, plants and animals around, to rule out allergens, keep the indoor air clean, if formula feeding, some babies need to be replaced with amino acid formula feeding. 3. Rash: redness and itching of the skin may be caused by medication or contact with allergic substances. 4. Gastrointestinal symptoms: If the baby is drinking protein-based drinks such as milk, protein allergy may occur and symptoms such as vomiting, bloating, diarrhea and constipation may occur. 5. If the child has breathing, rapid heartbeat, generalized flushing, low blood pressure may be anaphylactic shock, to seek immediate medical attention. In conclusion, newborns with allergic symptoms should seek immediate medical attention to avoid delay.