Lacrimal duct obstruction in newborns is a condition in which the nasal opening at the lower end of the nasolacrimal duct is closed by congenital membranous tissue, which prevents tears from flowing into the nasal cavity. There is a mucosal fold at the lower end of the nasolacrimal duct in the fetus, and this membrane disappears before birth. As this membrane tissue is still not ruptured around 4 weeks after birth, the normal secretion of tears can not be discharged through the nasolacrimal duct to the nasal cavity, tears will have to flow down from the cheeks, the baby appeared to not cry when there are tears or two eyes are always watery, or one eye has tears, one eye has no tears of the symptom. When the baby appears the symptoms of nasolacrimal duct blockage in addition to the tears spillage, there may be secondary infection of the lacrimal sac, which causes mucosal purulent secretions to form neonatal dacryocystitis, the newborn will have increased eye secretions, or even pus secretions and other symptoms. Parents are reminded that if a newborn develops any of these uncomfortable symptoms, it is important to seek medical attention in a timely manner and follow the doctor’s instructions for treatment to improve the symptoms of tearing eyes.