Full-month baby eyelid swelling, the common clinical causes are eye foreign body irritation, allergies and physiological factors. 1. Eye foreign body irritation: when the eyes accidentally enter the foreign body, such as insects, dust, etc., which will cause irritation to the cornea, conjunctiva, etc., infants frequently cry, etc., manifested as swelling of the upper eyelid, eye congestion, etc.. 2. Allergy: this is caused by the infant’s contact with allergens, such as pollen, dog hair, willow floss, etc., the clinical manifestations may have upper eyelid swelling, itching, erythema and so on. 3. Physiological factors: newborns in the womb of the pregnant mother is soaked in amniotic fluid, and thus after birth eyelids, eyelids, etc. will be more swollen, which is a normal physiological phenomenon, about a week after birth will improve. Full-term baby eyelid swelling, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.