Newborn: 12 to 13"
0 - 3 Month: 13 - 14"
3 - 6 Month: 14" - 16"
6 - 9 Month: 16" - 17"
9 - 12 Month: 17" - 18"
1T - 2T: 18" - 19 1/2"
2T - 4T: 19 1/2" - 20 1/2"
4T - preteen: 20 1/2" - 21 1/2"
Adult: 21 1/2" +
Measurements are taken around the widest part of the head, over the ears. Please note, that you or your child's age may not correspond to my sizes. Measurements will ensure you will receive a proper fitting hat. If your measurement hovers around 2 sizes, err on the larger size, so that it may be worn longer. Also, I take custom requests from micro preemies through extra large adults. Just use the blue, round chat bubble in the lower right corner to find out how.
