Infant 1 month spitting bubbles may be caused by physiological factors such as high saliva secretion, or pathologic factors such as pneumonia and thrush. 1. Physiological factors. The physiological function of infants is not well developed, may be too much secretion of saliva, resulting in excessive secretion of saliva, too late to swallow, thus the phenomenon of spitting bubbles. The cardia and pylorus of the infant’s stomach are at a horizontal level, which makes it easy for gastroesophageal reflux to occur, resulting in the phenomenon of spitting up bubbles or even spitting up milk. 2. Pathologic factors. It may be caused by pneumonia, thrush and other diseases. (1) Pneumonia. Pneumonia is caused by pathogenic bacterial infection and other causes, resulting in choking and coughing, cyanosis around the mouth, and respiratory difficulties. Infants may have symptoms such as spitting up, overflow of milk, and spitting up bubbles. (2) Thrush. Thrush is induced due to low immunity and other reasons, resulting in symptoms such as spitting up bubbles and white patches on the oral mucosa and other parts of the mouth. Babies 1 month spitting up bubbles, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.