I've read where some people get a pet id and engrave the info, then tie it on the shoelace. I'm not sure if they engrave it on the spot though. Another idea may be to check the mall if you have one nearby. With the holidays there is bound to be one of those engraving kiosks set up, they might have something small like that. I'm not sure what age your child is, but I've put my # on an index card & laminated it then my dd kept it in her pocket. This may not work w/ really small children though.