We are going to begin training next week for the animas pump. Can't wait to go live. He has been wearing it using saline and we are having trouble figuring out how to keep it on an active little boy. A belt with holder did not work too great. Then we tried sewing pockets on the back of t-shirts and putting the pump in there - but it sags in the back and was bothering him. I have been searching websites for solutions and haven't found anything yet. Any suggestions?