Swollen eyelids in babies may be caused by physiological factors, eye allergies, wheals, kidney or heart disease. 1. Physiological factors: babies drink a lot of milk and water before going to bed, sleep on the pillow is too low, or excessive crying before going to bed, etc., may lead to baby eyelid swelling, which is a normal phenomenon, usually after resting can gradually subside on their own. 2. Eye allergy: some babies are allergic, in contact with dust, pollen and other substances, it is likely to lead to eye allergies, may show the symptoms of swollen eyelids, can also be accompanied by eye itching, redness and other manifestations. 3. Eyelid swelling: due to long-term poor eye hygiene, it is easy to lead to the eyelid edge of the blepharoplasty is infected by pathogenic bacteria, induced by granuloma, resulting in localized eyelid lumps, resulting in eyelid swelling, can be accompanied by eyelid pain, tearing and other manifestations. 4. Kidney or heart disease: babies with acute nephritis, congenital heart disease, etc., may lead to water and sodium retention in the child’s body, which may cause eyelid swelling. Eyelid swelling in babies may also be related to other factors. If the symptoms persist or are accompanied by other discomforts, it is recommended to consult a doctor as soon as possible to confirm the cause of the swelling and then follow the doctor’s instructions for treatment.