I have been trained in children's yoga in a way that helps to prevent injury prevention, however, even when children and teens are properly supervised during exercise, there is a chance of potential injury.  Please be advised of such potential harm, and always ask a doctor if you are not sure if a particular exercise or program is appropriate for your child.  Do not allow your child to do any exercise that puts weight on their head or neck, and make sure that they have the proper space to move around.