Many children, no matter what age they are, some are newborns and some are one year old, will have drooling, making people feel that the brain is not well developed, which makes people worry. 1, newborns because the salivary glands are not well developed, the secretion of saliva is not a lot, but because the oral cavity is not well developed, the oral volume is small, there may also be drooling out. 2, some children in four or five months will add complementary food, because the stimulation of food leads to excessive saliva secretion, this time drooling is very normal, is to better digest food, but the baby’s mouth is very small, and can not be well self-regulation, will lead to drooling. 3, the general baby in the postnatal 4-10 months of age began to grow teeth, the process of tooth eruption, will lead to itchy gums, this time the child drooling is to reduce the pain and itchy feeling, these are very normal phenomenon. Children drooling pathological reasons are relatively few, sometimes drooling will appear fever or do not eat or bad spirit, there may be gingivitis or pharyngitis, etc., can also cause increased saliva secretion or due to pain children do not want to swallow saliva, this time it is necessary to seek timely medical attention.