Infant drooling may be caused by physiological reasons, inflammation of the throat area and other reasons. 1. Physiological reasons: when the baby drooling, may be the development of salivary glands, caused by the saliva secreted in the mouth increased significantly, but the baby swallowing function is poor, resulting in excessive saliva in the mouth can not be swallowed in a timely manner, the baby drooling, which is a normal physiological phenomenon. 2. Inflammation of the throat: when the baby suffers from acute tonsillitis, acute pharyngitis and other diseases, due to the presence of inflammatory reactions in the throat, under the stimulation of inflammation, may lead to increased salivary secretion, the baby can not swallow in time, the phenomenon of infant drooling, and also accompanied by cough, sore throat and other symptoms. After excluding the physiological causes of infant drooling, parents should take their babies to the pediatrician in the hospital in a timely manner to clarify the cause of the disease and then correctly treated under the guidance of the doctor.