One-year-old babies spit up bubbles, common causes include: physiological causes, respiratory infections and so on. 1. Physiological reasons: more than one year old babies often due to their own play, increased salivary secretion, teething stimulation, etc. lead to spitting bubbles, physiological situation, the baby’s spirit, appetite, sleep is good, no discomfort symptoms. 2. respiratory infections: because the baby will not cough up phlegm, if there is a cold, bronchitis and other respiratory infections, may also lead to the baby spitting bubbles, accompanied by fever, cough, runny nose and other symptoms. One year old baby spitting bubbles, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.