Baby’s eyes keep tearing may be caused by physiological reasons, or may be due to impaction, tear duct obstruction or dacryoadenitis and other pathological factors. 1. Physiological factors: some babies only have tears in one eye when they cry, and this phenomenon occurs even when they don’t cry. This is the tear duct has not yet fully dilated, so his tears can not be discharged, which is very common, usually after 1 year of age will be self-cured. 2. Inverted eyelashes: Some babies may have eyelid inverted eyelashes. These children’s eyelashes grow in the wrong direction, tilting towards the inside of the eye and rubbing against the cornea, which irritates the cornea for a long period of time and leads to the child’s constant tearing as well. 3. Lacrimal duct obstruction or dacryoadenitis: Lacrimal duct obstruction or dacryoadenitis is a common cause of babies’ constant tearing, when any part of the tear drainage channel (lacrimal duct) is obstructed, or inflammation of the lacrimal sac occurs and blocks the channel, there will be constant tearing and watering of the eyes, in addition, eye boogers can also occur, and even eyelid eczema, and in some cases, there is a phenomenon of pus overflow. When the baby’s eyes keep tearing and flowing, should go to the regular hospital for consultation, to clarify the cause of the disease, and under the guidance of the doctor for treatment.