I dissaggree with the idea of helmets on the kids. Why well unless the helmet is light enough, this could cause injury to the kids neck. Our vehicles with restraint systems are designed to protect us if rolled over. The bumps on the trails may cause the head to shake. With the extra wieght of the helmet this may cause injuries to the neck.
It sounds like a good idea but then again it doesn't even a youth helmet adds extra wieght to there heads.