Causes of 6-month-old children always sticking out their tongues include the following: 1, caused by internal heat constitution, if children belong to the internal heat constitution, they will have symptoms such as dry stools, yellow urine, as well as red tongue and always sticking out their tongues. Sticking out the tongue will make the mouth cool, which is a protective reaction, and can be relieved by applying honeysuckle water; 2, due to the symptoms caused by children suffering from ulcers, after the occurrence of tongue and buccal mucous membrane ulcers can also cause sticking out the tongue; 3, suffering from congenital stupidity can also cause always sticking out the tongue, congenital stupidity is due to the 21-trisomy, which is a chromosomal abnormality, and there is no particularly good treatment at present.