Awww, so cute! I wonder how well they fit an actual baby?
Are you on Ravelry? They show a baby wearing it on the main pattern page. Otherwise I can't find one either. I'll just have to hope it fits. It looks like it'll fit anywhere from newborn to 3 mos or so, but it is stretchy.
When asking questions ALWAYS post the name and a link for the pattern if you have it.