One-year-old baby eyelid redness and swelling may be caused by mosquito bites, allergies, bacterial conjunctivitis, etc., which can be treated through general treatment, medication and other ways. 1. Mosquito bites: one year old baby mosquito bites, due to the eyelid part of the skin tissue loose, mosquito bites will be prone to allergic reactions, the phenomenon of eyelid redness and swelling. Generally do not need special treatment, pay attention to local hygiene, do not scratch with your hands, you can relieve the discomfort by local cold compresses, such as cold towels or ice. 2. Allergy: when a one-year-old baby allergic to dust mites, dust, etc., can also cause eyelid redness and swelling, this situation needs to avoid contact with allergens, pay attention to maintain indoor ventilation, diligent sun bedding. 3. Bacterial conjunctivitis: If you don’t pay attention to the care of your baby’s eyes or your baby often rubs his eyes, it will cause bacteria to invade the conjunctiva and lead to bacterial conjunctivitis, which will result in redness and swelling of the eyelids, tearing and foreign body sensation. Under the guidance of the doctor can be treated by ofloxacin eye drops, applying erythromycin eye ointment and so on. One year old babies with red, swollen eyelids and obvious crying should immediately go to the hospital, improve the examination to clarify the cause of the disease, and then give the correct treatment under the guidance of the doctor.