Three-month-old babies drooling and spitting bubbles may be related to physiological factors, or may be caused by oral diseases, pneumonia and other reasons. 1. Physiological factors: three-month-old infants salivary gland secretion is more exuberant, and this period of time, young children swallowing ability is relatively poor, resulting in more saliva in the mouth can not be swallowed in a timely manner, may show drooling, spitting bubbles phenomenon. Along with the gradual growth and development of infants, swallowing ability is gradually enhanced, this phenomenon will gradually disappear on its own. 2. Oral disease: commonly found in oral ulcers, thrush and other diseases, due to the presence of germs in the mouth, under the stimulation of the infectious agent, resulting in damage to the oral mucosa, resulting in weakened ability to swallow, may show drooling, spitting bubbles, may also be accompanied by feeding difficulties, crying and other symptoms. 3. Pneumonia: three-month-old infants with pneumonia, resulting in increased phlegm in the throat, coupled with the age of this month, the child’s swallowing ability is poor, more phlegm and saliva can not be swallowed in a timely manner, it may show the symptoms of drooling and spitting bubbles, which may be accompanied by fever, coughing and other manifestations. Three-month-old babies drooling and spitting bubbles, there may be other causes, if accompanied by obvious symptoms of discomfort, you should seek medical attention as soon as possible, after diagnosis of the causative factors, by the doctor’s guidance for treatment.