Swollen eyes in infants may be caused by physiological reasons, and may also be related to pathological causes, such as blepharitis, nephrotic syndrome and so on. 1. Physiological causes: If the baby cries for a long time and rubs his eyes with his hands or does not get enough sleep at night, the child may have swollen eyes, which are usually not accompanied by other inappropriate, and can be relieved after resting, and do not need special treatment. 2. Pathological causes (1) Blepharitis: Blepharitis refers to suppurative inflammation of the eyelid glands. Under the stimulation of inflammation, children may have red, swollen and painful eyelids, which may be accompanied by tearing, increased secretion and other discomforts. (2) Nephrotic syndrome: If the child has renal disease such as nephrotic syndrome, due to the decrease of plasma osmolality, water enters into the interstitial fluid, and at the same time, the effective circulation is insufficient, thus water and sodium retention and edema of tissues occur, and the edema of the child is mainly in the eyelids, ankles and other parts of the body. Children with significant eye swelling are advised to seek prompt medical attention to assess their condition and follow medical advice.