4 months old baby drooling is very serious, is a more common clinical situation, there is no need to worry too much. Generally children in the newborn period, that is, from birth to about 1 month of time, his oral glands are still not well developed, at this time the saliva is relatively small, with the passage of time, the child’s saliva secretion will be more and more, itself children’s saliva relative to adults to more. For infants and young children will be more, especially for children who have reached 4 months, 4 months many children develop earlier, has begun to appear signs of tooth eruption, in the eruption of teeth, due to the stimulation of the gums and food changes, itself will also appear physiological increased saliva. In response to this situation, parents can promptly clean up the saliva and try to prevent too much saliva from causing skin eczema.