2 months baby mouth spitting bubble may be because the mouth is smaller, oral infection and respiratory tract inflammation. 1. Smaller mouth: the baby’s mouth is relatively small, when the oral secretion of saliva is more, not swallowed in time, the mouth can not store saliva, will spit out bubbles. 2. Oral infection: If the 2-month-old baby’s mouth is infected by bacteria, viruses and other pathogens and periodontitis, oral ulcers and other diseases, stimulate the oral secretion of inflammatory secretions, which leads to the baby’s mouth to spit bubbles. 3. Respiratory tract inflammation: including bronchitis, pneumonia, including respiratory tract inflammation, can stimulate the baby’s mouth salivary secretion glands secrete too much secretion, can not be swallowed in time, so will spit bubbles. Parents are advised to take their 2-month-old babies with foamy mouths to regular hospitals to find out the cause of the disease and follow the advice of professional doctors to choose the right treatment for them.