My 14 month old has fat feet. So I got him a half size bigger (4.5) and I got them in wide. I could NOT put this shoe on with socks, I could put it on without socks, but he cried and did not want to walk with them on his feet (he normally loves having shoes on, he has a weird obssesion with his shoes, maybe he got it from his mommy) They fit him weird and wouldn't  velcro all the way shut, it is only wide in the toe/ball of foot area, so I couldn't even get his heel to touch the bottom of the shoe! I could see these being good for those who have really really narrow skinny feet, but my son has very normal average fat baby feet, nothing out of the ordinary, nothing extremely huge or fat or wide. I am sending them back, thank goodness Amazon has such a great return policy.