The rib cuff is crocheted first, then the body of the hat is crocheted along the side of the cuff from the bottom up to the top. It is possible to crochet without cutting the thread from the start to the end.

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 head circumference 46-48 cm / 18-19 inches (1-2 years old)
Pictures of the finished product
Bonus: description of a similar hat for head circumference 50-52 cm / 19,5-20,5 inches (4-5 years old) with a classic rib cuff, without strings