First of all your son is young at 6 to be totally continent. However, as he seems to be only having the problem at school it may be related to diet or his toileting habits. I suggest you look at the following URLs as they discuss incontinence in children as well as some ideas for changing this behavior. UI in kids: http://www.seekwellness.com/incontinence/uti_in_childre n.htm and http://www.seekwellness.com/incontinence/bladder_disord ers_in_children.htm Behavioral treatments: http://www.seekwellness.com/incontinence/treatments4.ht m