I want to make this adorable GRACE Beanie for an infant (about 6 weeks old). The sizes on this pattern chart are given by the “inches around” of the head you’re knitting for, ranging from 16" heads, all the way up to a 23" head.
Ideally, I’d like to make this to fit an average 3-6 month old, since the baby will be nearly 3 months old by the time I can get it made and sent to her. Which head size should I use? :??
Children vary GREATLY in head sizes! I would probably do at least a 20" circumference, with ribbing to allow for smaller or larger head. If you make it too big, the baby can grow into it. If it’s too small, it’s destined to be a doll hat or simply unused at all. 
at birth, all 3 of my kids head circumferences were 14 inches. my now 14 month old’s is 18 inches, adn both my 6 year old and my 4 year old are 23 inches. if you’re aiming for a 3-6 month size, I would make the 16 inch size.
Thanks, Nicole. By “ribbing”, can you state that in dummy-eze, please? 
Do you mean that I’d add rows of ribbing before beginning the actual pattern? :??
This chart may be helpful 
Thank you, ladies. You’ve all be most helpful. 
Rebecca, I bookmarked that site, which I’m sure will come in handy many times!
ask the momma who just birthed that baby…i think she will tell you that her head is about 42" around! :rofling:
I would either add ribbing, or choose a pattern with ribbing already. Typically a knit ribbing for a hat is k1, p1 or k2, p2.
If I remember correctly, my kids were all around the 17-18" mark at birth, but they all grew at hugely different rates.
ROTFLOL! :roflhard:
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Thanks for the advice, Nicole! 
My kids are 13 and 15 (YEARS, not MONTHS) and I’d say the same!! :roflhard: