6 year old children with short chin may be a normal phenomenon caused by heredity, generally do not need special treatment; may also be caused by open-mouth breathing, there may be jaw dysplasia caused by different reasons, different treatment methods, according to the situation to take to correct the bad breathing habits, orthodontics and other methods. 1. Physiological factors: If the parents have the characteristic of short chin, then the 6-year-old child may also inherit the appearance of the parents, the appearance of short chin, which is a normal phenomenon, usually without special treatment, if there is aesthetic requirements, can be carried out after the child grows up surgical treatment. 2. Open-mouth breathing: if the child habitually open-mouth breathing, can lead to underdevelopment of the lower jaw and overdevelopment of the upper jaw, there will also be a 6-year-old child with a short chin, this situation needs to be corrected the child’s habit of open-mouth breathing, if the child suffers from nasal disease caused by open-mouth breathing, then you need to treat the nasal disease. 3. Mandibular dysplasia: Mandibular dysplasia can also lead to the symptoms of short jaw in 6-year-old children, treatment can take the child to the hospital stomatology department for orthodontic treatment. In addition to the above factors, other causes may also lead to 6-year-old children with short jaw symptoms, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.