Two-month-old babies spitting bubbles are divided into physiological and pathological factors. Physiologic factors are caused by the development of salivary glands and are normal. Pathologic factors may be caused by respiratory or digestive diseases, which are abnormal. As the baby’s salivary glands begin to develop at two months, there will be a small amount of saliva in the mouth, and at this time the baby’s swallowing function is not yet fully developed, resulting in the baby may not be able to swallow saliva. When the baby exhales, the gas will flow from the airway through the mouth, at this time not swallowed saliva between the lips appear saliva wrapped bubbles, that is, saliva bubbles, this situation is a normal phenomenon. When the baby has respiratory or digestive diseases, may lead to the baby’s nasal congestion, ventilation, breathing is not smooth, then the same may be in the exhale of the phenomenon of spit bubbles, and bubbles more viscous, small, this is not normal phenomenon. If the baby spit bubbles, in the exclusion of physiological causes, should promptly consult a doctor to clarify the cause of the disease, if necessary, the appropriate treatment.