These little flip flops are soooo cute! My 15 month old has small feet and probably wears a 3. We got these adorable flip flops in the 4-4.5 and they're a pretty good fit. She hated them the first couple times, but now she's fine (to be fair, she seems to hate all new shoes the first time she wears them). My only complaint would be the ankle strap has come off (off her ankle, not off the shoe) a few times while she's walking. I've noticed and fixed it before she tripped, but I'm a little worried for when it may cause some tripping in the future.