Newborns spitting bubbles in the mouth may be physiological factors, but also may be related to pneumonia and other pathological factors, the specific analysis is as follows: 1. physiological: due to the newborn’s body functions are still developing, part of the function is not yet perfect, for example, swallowing function, so the newborn’s oral secretion of a lot of saliva can not be swallowed, there will be the phenomenon of spitting bubbles, but with the newborn swallowing function of the perfection of the improvement, this is a normal phenomenon do not need to worry about. 2. Pathological: such as pneumonia, due to the newborn’s trachea is narrow and short, funnel-shaped, exhaling the lung gas through the narrow trachea, the sputum in the trachea out of the respiratory tract into the oral cavity, the phenomenon of spitting bubbles will occur, while pneumonia will also be accompanied by fever, redness of the face, irritability and other symptoms. Newborns spitting bubbles in the mouth may also have other causes, it is recommended to go to the hospital in time, relevant examinations, clear causes and then actively treat the symptoms.