Tattoo in memory of baby/miscarriage?

I recently had my 2nd miscarriage. I'd like to get a small tattoo in "honor" of my two babies who are in heaven. I'd like 2 little foot prints on my lower right side of my back with a bible verse under it. I'd like to get a footprint for every pregnancy I have. they're all going to be small--maybe the size of a nickel. my question is: how can I distinguish my miscarriage baby feet from the babies that will live? Any cute ideas?