JennyAnne022776:Are you talking about the stickers that people put on the onesies? If so, etsy. I'm not sure what a one month onesie is.
Oh! I just thought she was talking about every day onesies...oops.
35baby:yes I meant the stickers although I didn't realize that is what they were. What is etsy by the way?
It's a website for people to sell homemade items through their shops. There are literally hundreds of different designs of stickers. I think I went to the website and searched under baby stickers months or something like that. Mine were somewhere in the area of $7-9 per set.
ETA: I was going to link you to the woman I bought them from, but there's a message on her shop saying that she's on maternity leave. There are tons and tons of other people who sell them though.
I bought mine here on Etsy. Search monthly onesies stickers.