Baby’s eyes water when drinking bottle is usually due to conjunctivitis, incomplete tear ducts, tear ducts are not well developed and other reasons. 1. Conjunctivitis: Conjunctivitis is an eye disease, usually caused by corneal infection, adjacent tissue diffusion, etc., which can cause tearing, redness and swelling, etc., and when the child’s mouth is closed during breastfeeding, there is an increase in nasolacrimal duct pressure, resulting in the baby’s eyes watering when drinking a bottle of milk. 2. Lacrimal gland incompetence: Lacrimal gland incompetence is generally due to inflammation, trauma, foreign bodies and other reasons, which can lead to tearing, pus flowing from the corner of the eye and other symptoms, resulting in the baby’s eyes watering when drinking a bottle of milk. 3. Lacrimal gland underdevelopment: Lacrimal gland underdevelopment is generally due to congenital dysplasia in children, frequent tearing, eye pain and other symptoms, when the child drinks milk pressure on the nasolacrimal ducts, the baby’s eyes when drinking a bottle of watery eyes. It is recommended that the patient go to the hospital for examination in time and pay attention to body care as well as dietary health.