I just ordered these for my 4 year-old, who wears a 9.5/10.  The XSmall (9.5-10.5) is way too small.  I'm exchanging them for the small, but honestly those might still be too tight.  Order up at least a size, maybe two!

Otherwise, these are nice slippers.  Soft, pretty, warm.  Rubber soled.  Once we get the correct size, I think we'll like them.