Head Sizes

I don't remember where I got this (so if I stole it from you, give me a holla and I'll give you credit), but I found it to be very helpful.

Head sizes (circumference):

Newborn		13-14"
3-6 months		14-17"
Toddler		18-20"
3-10 years old		19-20.5"
Teens		20.5-22"
Woman		21-23.5"
Man		22-24.5"

I always make hats a little smaller than the circumference of the head, because they are stretchy.