Babies always spit, there are physiological and pathological factors (oral ulcers, pneumonia, inflammation of the gums) and other causes. 1. Physiological factors: the baby’s rapid growth and development, the secretion of salivary glands is also relatively exuberant, and the baby’s swallowing function is relatively poor, there may be the phenomenon of spitting; in addition, some physiological stimuli such as oral teething, will stimulate the child’s salivary glands to secrete saliva, the occurrence of spitting. 2. Pathological factors: some diseases such as oral ulcers, pneumonia, inflammation of the gums, etc., will make the salivary glands secrete saliva, spitting will occur. In addition, some diseases that lead to neurological abnormalities, such as 21-trisomy syndrome babies, will also appear spitting. Babies always spit, there may be other reasons, it is recommended to go to the hospital in time, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.