My kid is 18months and average percentile and with a small pull of the draw string it fit fine. He's super active and has until now been more annoyed by hats getting in his way of looking at cool stuff. Somehow this hat isn't a problem for him. Did a week at the beach at he sported it the whole time. Also, I noticed that when I went to wash it has a great DWR to protect from the rain. Looking forward to some bad weather.