L. is modelling the smallest hat, which as you can tell, is a little small on her noggin. It has a 16 1/4" circumference. It would fit a newborn and A. discovered that it also fits the Addy American Girl doll to a 'T'. We'll call this hat 'Baby Blue'.
L. now models a larger hat, with an 18" circumference. It is made from a slighter stiffer fabric and is lined, so is not quite as floppy as the others. It would fit a toddler...or a baby with a larger head than L.'s. We'll call this the 'Not-So-Floppy Hat'.