Babies sticking out their tongues all the time are usually caused by cerebral palsy, baby’s teeth growth, salivary gland secretion function and other factors. 1. Cerebral palsy: due to intrauterine hypoxia or ischemia and hypoxia at birth, the baby’s brain tissue is undernourished and affects the neural development of the brain, which makes the sublingual nerves and muscles function abnormally and the baby frequently sticks out his/her tongue. 2. Baby teeth: babies in about four months will sprout small teeth, at this time to grow teeth will appear in the area of soreness, itching symptoms, and the development of small babies in all aspects of immaturity, can only be often stick out the tongue to ease the discomfort caused by growing teeth. 3. Salivary gland secretion function: because the baby’s swallowing function is not fully developed, when the salivary gland secretion, the baby can’t swallow all the saliva secretion in time to the stomach, which will make part of the saliva from the corner of the mouth out, which will cause the child to frequently stick out his tongue to lick out the saliva. Babies always stick 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.