Love this hat for my little boy. It is one of the only hats I have found that stays in place. It does not slip around, and it also does not move around when he pulls on it, which was a problem with a lot of other hats. He gets tons of compliments on it as well! I ordered the 12 month size for him when he was 9 months old, and it fit fine. He is in the 50th percentile for head size.