In general Crocs run a little big but not so big that they fall off and with a growing baby having some room for growth is always a good thing. These shoes are so easy for a parent of an on-the-move toddler. I don't need to change his shoes when he goes in the sprinkler in the park, they clean really easily and they are light as air. I thought at first he may have trouble walking in them but that fear was proved wrong. He was running in them 5 minutes after I put them on for the first time. I personally have never been a fan of Crocs for myself but for my 13 month old they are perfect. They look super cute too!