L.M.
I laminated my 1st sons ultrasound and that was a BAD idea - so do not do that. With my second son, we took the ultrasound pictures to Kinkos and had them copy them and enlarge a little bit and they are beautiful. I would definitely recommend having a customer service person at Kinkos copy them - they will be preserved and you will not have to worry if in the future the picture fads.
Good luck - Jamie