3 months old baby drooling, more consideration belongs to the normal physiological phenomenon, but there may be oral diseases caused by the need to check the baby’s oral cavity, pay close attention to the baby’s crying, spiritual situation, according to the situation to deal with. 1, physiological factors: 3 months old baby salivary gland development and function gradually perfect, the secretion of saliva will gradually increase, but the baby’s swallowing function is not well developed at this time, can not swallow in time The saliva secreted, so there will be the phenomenon of saliva outflow. The above situation will disappear on its own as the baby grows older and swallows better. In addition, when the baby’s milk teeth erupt, it will stimulate the reflexive secretion of salivary glands to increase, which is also a normal situation and usually does not require special treatment; 2, pathological factors: 3 months old baby thrush, mouth ulcers, etc., in addition to drooling, there may be abnormalities in the oral mucosa, such as white patches or ulcers on the surface of the oral mucosa, the baby refuses to eat, crying and so on. If the baby is drooling, the parents need to use a handkerchief to dry the drool, but the action should be gentle, it is best to put a bib around the child to prevent the drool from wetting the clothes. The clothes stained by the baby’s drool should also be washed and dried regularly to avoid breeding bacteria.