When a baby is born with one eye that is always watering and has eye boogers, the most common thing to consider is tear duct obstruction, because after birth, the lower end of the nasolacrimal duct may be incompletely developed, or the mucosal folds of the lower end of the nasolacrimal duct may be retained at birth, leading to tearing. If there is secondary infection of the lacrimal sac, there will also be ophthalmoplegia, which is a mucous or purulent discharge. In most children, the lower end of the nasolacrimal duct will open on its own as the child grows. Local massage can also be used to help open the lower end, which involves placing the index finger in the lacrimal sac area and performing regular massage and squeezing, 3-4 times a day, with more than 20 strokes each time. After the massage, antibiotic drops, such as tobramycin drops, can be used, and usually after a few weeks of adherence, the lower end of the lacrimal duct will open on its own in most children. If the above conservative treatment has no effect, usually when the baby is 3-4 months old, we should consider the tear duct exploratory surgery, artificially pierce the lower end, to form the effect of patency.