Patagonia makes the cutest kids hats for sure. They also happen to be one of the very few hats my 5 month old doesnt hate wearing. He is pretty indifferent towards this one which I take to mean it is comfy. It also does a great job keeping the sun totally off his face without looking comical like some outsized baby sun hats.
The XS in this hat was about the only sun hat we could find that was small enough for our 2 month old. She doesn't mind wearing it at all and it's great to shade her while we're out hiking and she's in the baby bjorn (or eventually in an infant carrier). Pretty cute too!
Fit my 9 month old perfectly. She kept it on most of the time which is pretty good since she always rips bows and stuff like that off of her head. So it must be reasonably comfortable. And my wife and I thought it was very cute on her. Good buy.
The main things is my 7 month old keeps it on, which is a huge success. We got the small and it fits great.