The hat is crocheted by turning rows with half double crochets, single crochets and with some extended rows and with some shortened rows. The hat has one back seam.

PDF-pattern included:

Tools and materials
Yarn advices
Approximate yarn usage, gauge and hook number
General method of crocheting the hat
Crochet description row by row for three different hats
Crochet diagrams for each hat with different number of rows
Pictures of the finished product
Calculations for three sizes (1 year, 3 year, adult):

1. head circumference 45-48 cm / 18-19 inches (1 year old).
2. head circumference 49-52 cm / 19,5-20,5 inches (3-4 year old).
3. head circumference 54-57 cm / 21,5-22,5 inches (adult size).