Infants are screened for allergens mainly through blood tests. Usually, infants can be brought to the hospital for blood tests on an empty stomach to identify any allergens, so that they can avoid contact with them in their daily lives. At the same time, oral desensitizing drugs can be given appropriately for the treatment of allergies during the period of allergy, commonly used are loratadine, which can be combined with oral vitamin C, etc., all have a desensitizing effect. During the allergy period or when allergic reactions occur frequently, parents can also give their infants appropriate oral medications to improve immunity, such as transfer factor oral solution and splenamine-freeze dried powder, etc. By improving the infant’s immunity, the infant can also avoid the recurrence of allergies.