Tears normally leave the eye through small openings on the edges of the eyelids. After passing through these openings, the fluid drains into the nose through nasolacrimal ducts.
Sometimes babies are born before these ducts are completely open. This causes excessive tearing and discharge from the eyes. Most children grow out of it.
However, if tearing continues it can cause irritation and infection leading to a permanent blockage called nasolacrimal duct obstruction.