So I decided to make a hat for a 10 year old using this adult small pattern but then decided it was too big so instead of using the 6-10 year old pattern which is one size smaller, I simply used a 5.0 mm hook instead of 5.5 mm hook and the same adult small pattern. So now I think this hat would be better suited to a young adult hat size.
Hats for comparison…

Cute!
Thanks!