Baby spitting foam is divided into physiological and pathological two kinds, physiological spitting foam baby, good mental state, no other abnormal performance, the reasons are considered as follows: 1, the baby’s salivary glands are not fully developed, excessive secretion of saliva, swallowing function is not perfect, the mouth is relatively shallow, resulting in excessive saliva will be excluded in the form of spitting foam, the baby grows up a little bit, the symptom of spitting foam will be significantly improved. 2, the baby’s The development of the digestive system is not perfect, the undigested milk flows into the mouth, resulting in the phenomenon of baby spitting foam, should pay attention to control the amount of milk, less food, more meals.3, the baby’s gums when teething tissue produces mild discomfort, thereby stimulating the nerves on the gums, causing the phenomenon of spitting foam. Pathological spitting foam is mostly seen in pneumonia, especially in small babies, the performance is more atypical, with spitting foam as the main manifestation, accompanied by nasal congestion, loss of appetite, shortness of breath, some of the baby’s throat can be smelled with phlegm sounding, you should immediately seek medical attention.