Nine-month-old baby always sticking out the tongue to pay attention to the following diseases may be: first, inborn metabolic diseases or chromosomal diseases may exist, in addition to sticking out the tongue is often accompanied by special facial features, such as low bridge of the nose, the eye crack is small, the distance between the eyes is wide, both eyes canthus upward, small ears, the presence of both hands through the palm lines, etc., such as the performance of the above should be promptly to the hospital for medical treatment, if necessary, for the genes of chromosomal disorders check. Secondly, it is a normal phenomenon, September-age babies are in the stage of imitating the voice, imitating the situation of adults, parents pay too much attention to the baby will aggravate the phenomenon of sticking out the tongue, but the other conditions are good, such as crawling, pulling the hands will walk, will express welcome, goodbye, etc., there is no special harm, after a period of time, it will disappear naturally.