The reason for this symptom is more than one, including normal physiological reaction and oral diseases. It is recommended to go to the hospital for examination to clarify the specific reasons for targeted treatment. 1, normal physiological reaction: one and a half year old baby is in the teething period, there will be gum discomfort symptoms, gums are stimulated, causing increased secretion of saliva, the phenomenon of drooling. Belong to the normal physiological reaction, no need for special treatment, as the baby grows older, the symptoms can be self-corrected; 2, oral diseases: including oral ulcers, oral herpes, stomatitis, etc., can lead to baby pain, while due to the local stimulation of the baby’s mouth by inflammation and other factors, can promote the secretion of saliva, resulting in the phenomenon of one and a half year old baby drooling. It is recommended to actively treat the original disease, such as for oral ulcers, you can guide the one-and-a-half-year-old baby to eat more vegetables and fruits, such as cabbage, apples, etc., and drink more water. Can also use rehabilitation new liquid for gargling under the guidance of the doctor to relieve the symptoms; 3, other causes: including abnormal digestive function, cerebral palsy, brain and oral function dysplasia and other reasons, such as abnormal digestive function of the baby, may lead to increased secretion of gastric acid, salivary glands secrete more saliva, thus causing the symptoms of one and a half year old baby drooling. Probiotic drugs such as Bacillus subtilis dibacterium granules and Bifidobacterium triptans can be used under the strict guidance of the doctor to regulate the intestinal flora and promote digestion, which can help improve the symptoms of drooling in one and a half year old babies.