My niece wears a 6 toddler in every other shoe tried these on her and they were almost 2 sizes too small!! My niece is very petite so even though there were reviews about them being small I figured she's so small they'd fit her. Nope I was very wrong so I returned them. It's unfortunate because they were cute and they seemed like a pretty solid swim shoe especially for the water parks and their endless amount of cement. Ended up buying a $5 pair at Walmart that worked out great with room to spare.