I have no clue. I ried them on DD the other day at the store and she would be a size 2 in them withtout socks though. With the socks, the size 2 won't even go on and we are not talking about thick socks. So I tried size 3 with socks and they fit but with plenty of room up front. But would she trip with the size 3 on if she is standing and moving her on the floor?
I'm not sure how they are supposed to wear them. TIA
Re: Robeez: with or without socks?
I always use them with socks. DD's are a little big (kind of like you described with the size 3s) and she doesn't trip on them at all. Plus if there's room to grow you'll get your money's worth!
Another tip-- try ebay. I was kind of surprised how expensive Robeez are in the store, but I have bought 5 nearly brand-new pair on ebay for under $40-- for all of them. You can barely tell they've been worn.
Marshall's has really cute Robeez for $14.99. I also like the Ministar ones from Target for $12.99. DS also has a pair from Land of Nod which are adorable.
We wear them with socks - DS has sweaty feet!