Infants always spit out their tongues, there are physiological reasons, there are also pathological (oral ulcers, herpes) factors. 1. Physiological reasons: infants salivary gland secretion is more, but the development of swallowing function is immature, did not learn to take the initiative to swallow, so the saliva is more will appear with the tongue to lick saliva around the mouth, the performance is always spit out the tongue situation. Teething children because of gum discomfort, some babies will also appear to spit out the tongue. 2. Pathological reasons: mouth ulcers, throat herpes, because of local pain, will also appear to spit out the tongue. Brain dysplasia, mental retardation children often stick their tongues out of their mouths. Babies always spit out their tongues, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.