Babies keep sticking out their tongues may be related to play, drooling and mouth ulcers. 1. Playing: infants like to use their tongues to sense things outside, and they may also imitate tongue out, which is normal. 2. Drooling: babies keep spitting out their tongues, which may be caused by drooling. Babies’ salivary glands are more vigorous and will secrete more saliva, and the capacity of the oral cavity is relatively small, so the phenomenon of drooling occurs, and babies will spit out their tongues and spit out their mouths. 3. Mouth ulcers: Mouth ulcers in an infant’s mouth can cause painful symptoms, and may relieve the pain by spitting out the tongue. Babies have been spitting 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’s treatment.