J.A.
There are products out there that are designed for special needs children that you might find useful. One is child safety temporary tattoos. They tattoo your contact information right on the child. Another idea is to use shoelace child safety IDs. (http://www.kidsbmv.com/merch_details.asp?ProductID=1005-1) They can be used with velcro shoes too. You can also use ID tags on a lanyard. Try googling for child safety ID.