Generally speaking, swollen eyes of babies with allergies are treated promptly, and often the swelling can be reduced in 1-3 days. This is because there are more causes of eye allergies in children. Such as the application of drugs or eating fish, shrimp and so on, these allergens will stimulate the child’s allergic reaction, resulting in swollen eyes, itchy eyes and other symptoms. In this case, after getting rid of the allergen or after taking oral antihistamines such as loratadine and cetirizine. The child’s allergy symptoms will improve significantly, and the improvement time is mostly short. In mild cases, the swelling of the eyes can be reduced within a day, and in severe cases, most of them will improve within three days.