Two-month-old baby mouth spitting bubbles, generally due to the normal secretion of salivary glands inside the baby’s mouth, but the baby swallowing function is not very perfect, because the secreted saliva can not swallow, so the baby filtered out of the mouth, this is a very normal phenomenon. However, there are also babies who spit bubbles in their mouths as a sign of pneumonia, but generally these bubbles are sticky and small, while the baby may be accompanied by coughing, coughing phlegm or frequent choking, crying and restlessness in bed at night, and even the performance of purple around the mouth. If there is such a problem, consider that the baby is most likely pneumonia caused by the mouth spitting bubbles.