There are more reasons for three-month-old babies to spit out their tongues, which may be a normal physiological phenomenon, or it may be caused by oral diseases and other diseases. If after observing your baby for a period of time, the symptom of frequent tongue out still exists, or other symptoms appear, it is recommended that you take your baby to the hospital for examination and treatment in a timely manner.1. Normal physiological phenomenon: three-month-old babies are in the stage of growth and development, and they will sense the outside world by spitting out their tongues or stick out their tongues to lick the saliva when the baby is drooling. These are normal physiological phenomena, do not need treatment intervention, after a period of time will naturally stop; 2, oral diseases: such as mouth ulcers, thrush, etc., these diseases will cause symptoms of oral pain, so the baby will be through the tongue to express discomfort. In this regard, you can target the cause of the treatment, such as the baby suffers from mouth ulcers, you can follow the doctor’s instructions to the baby supplement vitamin C, the local use of ice boron powder, and pay attention to oral hygiene. Thrush babies can follow the doctor’s advice to use mycotoxin for treatment; 3, other diseases: for example, cerebral palsy, cerebral palsy will lead to mental retardation, so that the baby can not control their own behavior, thus appearing the performance of spitting out the tongue. At present, there is no effective medicine to treat cerebral palsy, mainly through life guidance to improve the symptoms, such as targeted training and guidance for babies, guide babies to correct the habit of spitting out the tongue.