I have done it!
I took the onesie's cut off the part underneath where the snaps are, then I rolled it under and hemmed it by hand. It fits him fantastic! They are Carter's new born onsies in little "boy" colors ie blue, yellow and green stripes on white background.
I only paid $1.00 for for each of the two onsies and now that I know I can do this I will go back and get some more

These were the short sleeve ones and they seem to work fine, I would love to find some long sleeve ones.
I do have to say that the girls outfits are so much more fun! Can I make believe Happy is a girl? LOL
I also told my Mother that she can now officially buy baby clothes lol, she has been complaining about us not having any children

he he he!