The sizing for the hats is as follows: Newborn -3 months - circumference of 14-15" 3-6 months - circumference of 16 -17" 6-12 months - circumference of 17 -18" 1-3 years - circumference of 18-20" 3-10 years - circumference of 20-22" Adult - circumference of 22-23" Adult L - circumference of 23-24" Adult XL - circumference of 24-25" If you need different color or sizes, please, send me a message. I'll do my best to help you with your choice.