Infant spitting, may be physiological or pathological factors, physiological factors such as excessive secretion of salivary glands; pathological factors such as oral ulcers, etc., can cause infants to spit. 1. Physiological factors: infants are at the peak of growth and development, the rapid development of their salivary glands, resulting in excessive secretion of saliva, but the swallowing ability of infants is still poor, so they can only spit out some saliva in order to discharge excessive saliva. 2. Pathological factors: when the infant suffers from oral ulcers, there is pain when touching the ulcers, which causes the infant’s saliva secretion to increase, resulting in the infant spitting. In addition, pharyngitis, also due to oropharyngeal pain, promote salivary secretion at the same time affect the infant swallowing, spitting. If accompanied by coughing, shortness of breath or difficulty in breathing, foaming at the mouth has the possibility of pneumonia. Infants spitting, there may also be other reasons, it is recommended to go to the hospital in a timely manner, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.