Is it normal for babies to drool in their sleep? According to the baby’s different performance to give judgment, the following common situations: 1, is a normal phenomenon, mostly seen in 3-4 months old baby, this age baby is in the salivary glands in the development of the exuberant period, and the swallowing function is not yet perfect, secretion and swallowing function is not coordinated, thus appearing the phenomenon of drooling, with the increase in age, the swallowing function is perfected gradually will be improved. 2, the oral muscle muscle tone is low, baby The baby’s mouth and lips, buccal or tongue muscles have low muscle tone and drooling phenomenon, to give the mouth and muscle tone test, if necessary, give the mouth muscle massage. 3, some genetic metabolic disease, the baby is mostly accompanied by a special face, mental retardation, mouth salivation, etc. If you have the above performance, please go to the hospital for examination. If you have the above performance to the hospital examination, if necessary, give rehabilitation treatment.