E.C.
My son wore a size 6 last summer and is in about an 8 right now. He turned 2 at the end of last summer and will be 3 mid-August. I did buy him a few pair of summer shoes last year in a 7 and he was able to wear them for a bit, but I did end up buying new ones. I also had a few that never worked. I eneded up listing them on Craigslist for what I paid for them and they sold right away!! I hope that helped a little.