Three-month-old babies spit up bubbles can be observed to see if the baby has a stuffy nose, cough, runny nose, mental depression and other manifestations. If there is any of the above abnormalities, need to promptly seek medical attention. If simply spit up bubbles, good spirit, good appetite, stable breathing, mostly considered a normal situation. Three-month-old baby swallowing ability is relatively poor, and saliva secretion is vigorous, there will be spit bubble phenomenon, can be a normal situation. But if the baby spit bubbles, accompanied by other uncomfortable symptoms, such as nasal congestion, cough, runny nose, shortness of breath, respiratory effort, decreased appetite, depressed, is not normal, it is recommended to take the baby to the hospital to check out, follow the doctor’s instructions for targeted treatment.