There are many reasons why a three-month-old baby keeps spitting out his tongue, which may be caused by normal physiological factors or by disease factors, such as mouth ulcers, epilepsy, chromosomal disorders, poor breathing, etc. A. Normal physiological factors: 1. Mouthful period: During this period the baby is focused on what is in the mouth, often by spitting out the tongue or licking to explore the outside world. At this time, parents should pay attention to the baby’s belongings for cleaning and disinfection, to avoid disease from the mouth; 2, saliva secretion: more than three months baby saliva secretion, and poor swallowing ability, saliva will wet the mouth and around the mouth, at this time the baby will like to lick with the tongue, thus the phenomenon of spitting out the tongue, parents should pay attention to wipe the baby’s saliva in a timely manner; 3, tongue reflex: some babies spit out the tongue belongs to the tongue reflex The reflex will gradually disappear after 6-7 months and no special treatment is needed. Second, disease factors: 1, oral diseases: such as oral ulcers, herpes stomatitis, thrush, etc., pain will stimulate the salivary glands to secrete a lot of saliva, resulting in baby drool, but three months baby’s swallowing ability is still poor, can not swallow the saliva in time, so will always spit out the tongue to lick, while the baby will be accompanied by refusal to eat, irritability and other symptoms; 2, epilepsy: epileptic seizures can appear frequent spitting tongue performance, while often accompanied by shrieking, restlessness and other symptoms. 3. chromosomal diseases: such as trisomy 21, the baby will also show frequent tongue licking and often have special facial features such as small eye slits, wide eye spacing, and flattened face. Other diseases that cause developmental delays in infants may also cause babies to spit out their tongues frequently; 4, poor breathing: when the nose is blocked due to colds, rhinitis, adenoid hypertrophy, etc., babies will breathe through their mouths by spitting out their tongues to relieve the discomfort caused by nasal congestion; 5, lack of iodine: long-term iodine deficiency can lead to endemic cretinism, which, in addition to spitting out tongues, is accompanied by a special facial appearance (such as flat nose, small eye fissures, puffy eyelids, dull expressions, giggles, etc.), mental retardation, motor disorders, etc.