I havn't had Devons feet measured yet, may have to go to Clarks and ask even tho I'm not buying there at mo! He is 12 mths, and I have a pair of mothercare size 3 crawlers , but there is loads of room, got them as we have wood floors and the "sock ons" only go to 12 mths and so his socks fall off, and also to keepl feet warm in snowsuit (without feet, as I brought big to last!!). I'm just guessing he is a 2 ish, will have to find out.
My sons , were both 4 and 4 and a half at 12 mths and then 13 mths when they had there shoes, but my daughter was 18mths and I couldn't get shoessmall enougth via clarks for our wedding for her to go with her dress, so I had to go to next online to get sparkly pink size 2 trainers!!