How they behave These children have no control over their physical action as their body does not behave according to their will and sometimes it become a cause of the embarrassment for the person who is accompanying them . They are not the normal children and it is a matter of great patience to handle them. This patience is the major factor to handle their unwarranted actions. They behave this way because of mental deficiency as their I.Q. is quite low in comparison to the other children of their age. Sometimes it is hard to be detected in some cases as these children are just slow in taking commands and up to this time, because the things are not so cleared, they go unnoticed.