How does baby dacryocystitis cause?

about infant dacryocystitis is how to cause? After the baby is born, generally two or three months ago, there are some children, nasolacrimal duct has a layer of valve may not be completely broken, generally to two or three months after the valve should be broken. If it is not broken, it may cause lacrimal duct obstruction, tears can not be smoothly discharged to the lower nasal passage. The tear water will remain in the position of the lacrimal sac, and the tear water itself is a good culture medium, which can cause bacterial infection and inflammation of the lacrimal sac, that is, neonatal dacryocystitis. The main manifestation is that the baby will obviously shed tears, and there are many sticky purulent secretions at the corners of the eyes.