I have a grandchild who has been diagnosed with bipolar disorder and behavioral problem and it is very difficult to deal with her at time. She has been in centers and had many theraphist and doctors seeing her. We want her to be better and need help in how to deal with her when she get in those bad moods. She  was about 5 or 6 when this disorder begin with her but we didn't understand what was going on  until we begin to seek help during her school course. Is this disease common in young children and what step can we take in helping her do better.