Last spring I made month to month onsies for a friend of mine who had a little girl. The idea is they wear them each month for a picture to document their growth. I used transfer paper, and I posted the process here. I feel like onsies are fairly forgiving, but I also have seen these little round stickers you can buy for onsies (though the older the kiddo gets heading towards that '12th' month, the more the likelihood you may need to sneak this sticker on from what a few friends shared). I decided I wanted to recycle the idea for my friend Maurine who is having baby boy #2 in just a few short weeks. She is also in love with all things Disney, as is her first little guy, Donovan. I decided to explore the options of making my own stickers, and personalizing them with a Mickey them (which went with my whole gift....more on that soon).
here (I just used 'snag it or print page' and a free Disney font to change the month).