Drooling is a condition in which saliva flows out of the mouth unconsciously. The reasons are as follows: 1, within 1 year old infants because of the small volume of the mouth, saliva secretion, coupled with the stimulation of the gums by teething, most will drool, but with the growth and development, about 1 year old drooling phenomenon will gradually disappear; 2, cerebral palsy, congenital dementia, etc.; 3, suffering from mouth ulcers or weak spleen and stomach will also drool, for example, after the baby grows to 6 months, the body organs obviously change, the baby needs nutrition can no longer be limited to breast milk. At this time, the nutrition required by infants can no longer be limited to breast milk, to gradually use rice paste, vegetable puree and other nutritious and easily digestible food to supplement, some breastfeeding to more than 15 months before weaning, weaning and then feed supplemental food, this child’s spleen and stomach is weaker, easy to digest indigestion, this time the highest frequency of children drooling; 4, often pinch the child’s cheeks, causing mechanical damage to the parotid gland, resulting in saliva secretion 5, oral inflammation: such as catarrhal stomatitis, bacterial infectious stomatitis, stomatitis caused by herpes virus, etc., can stimulate the secretion of salivary glands and lead to drooling; 6, various injuries and lesions of the thalamus may lead to salivation: such as carbon monoxide poisoning, encephalitis, etc.; 7, children with facial nerve palsy, due to local neurological decompensation or disappearance, affecting the saliva 8, congenital diseases: such as congenital hypothyroidism, also often has the performance of salivation, accompanied by mental retardation, slow reaction, dull gaze, crying, tongue sticking out of the mouth and other symptoms.