The uber-smart Cosy has the answer to the eternal question: When IS the hat DONE?

It’s in her 2nd post in a super helpful series on knitting hats.

approximate hat heights

0-6 mo. – 5 in. (12.7 cm) 6-18 mo. – 6.25 in. (15.9 cm) 18 mo.-4 yr. – 7.25 in. (18.4 cm) 4 yr.-adult s – 8.25 in. (21 cm) adult m-l – 9 in. (22.9 cm)

Read her whole post here.