where do I get

Those little things that you iron on or stick on to a onesie that says 1 month, 2 month, 3 months etc.?

If you have a printer, you could buy the iron on transfer paper, design or find the number online and then print it out to stick on  

Or there's etsy. Etsy has everything!  

There is a ton of them here  

http://www.etsy.com/search?q=monthly+onesie+sticker&view_type=gallery&ship_to=US&ref=auto1

Quoting Leilani Allyssa's Mommy:" Those little things that you iron on or stick on to a onesie that says 1 month, 2 month, 3 months etc.?"

Michael's , Hobby Lobby.. online..

Thanks everyone!