2 years old baby oral development has not been perfect, shallow mouth bottom, swallowing function is not fully established, saliva secretion increased, not swallowed in time, prone to drooling phenomenon, belongs to the normal physiological phenomenon. Parents are advised to dry the baby’s saliva in time, to keep the perioral area dry, to prevent local skin drool rash. But should also be alert to disease, such as oral ulcers or thrush, systemic diseases, etc., if necessary, should take the baby to the doctor for examination. I. Normal physiological phenomenon: baby’s milk teeth start to erupt at 6 months, 2.5 years old full grown. This process of tooth eruption stimulates the gums, which can lead to itchy and uncomfortable gums, which in turn stimulates the mouth and makes the mouth more saliva. Parents need to pay attention to the baby’s oral hygiene to prevent decay of the erupting teeth. When the erupting teeth stimulate the gums can use harder teething cookies, teething sticks to relieve, and at the same time need to pay attention to oral care. Second, disease factors: 1, oral ulcers or thrush: When there are oral ulcers and thrush, the mucous membrane in the mouth can produce a burning sensation, discomfort, especially after eating stimulation aggravated, resulting in increased pain, will stimulate the salivary glands to increase secretion, the phenomenon of saliva. If crying occurs when eating, the buccal mucosa and tongue on both sides of the mouth should be checked for the occurrence of oral mucosal diseases; 2. Systemic systemic diseases: If drooling is accompanied by intellectual or developmental abnormalities and lagging, it is recommended to visit the neurology department to investigate systemic systemic diseases, such as congenital brain dysplasia and encephalitis.