Two-year-old baby eyes old tears may be physiological phenomenon, may also be a symptom of certain diseases, such as tear duct blockage, conjunctivitis, etc., should be timely consultation to find out the cause. 1. Physiological factors: two-year-old baby eyes tearing, may be due to eye irritation caused by, such as dust, onions, etc., the child out of these irritants, the symptoms can be improved. 2. Pathological factors (1) Lacrimal duct blockage: Inflammation, trauma, nasal lesions and other factors may lead to blockage of the lacrimal duct, lacrimal sac, lacrimal punctum and other parts of the lacrimal duct, tear drainage is not smooth, the patient will appear tear overflow phenomenon, that is, a large number of involuntary tears in daily life. (2) Conjunctivitis: Conjunctivitis can be caused by microbial infections and external stimuli. Under the stimulation of inflammation, children may experience discomfort such as photophobia, tearing, and foreign body sensation in the eyes, which may be accompanied by conjunctival congestion, edema, and increased secretion. It is recommended that children with frequent tearing should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.