Sizes:
newborn, (baby), toddler, (child), XS, (S), M, (L)

Head circumference:
39-41cm/15.5 - 16.5” (42-44 cm/16.5 - 17.5”) 45-47 cm/17.5 - 18.5” (48-50 cm/18.5 - 19.5”) 51-53 cm/19.5 - 21” (54-56 cm/21 - 22”) 57-59 cm/22.5 - 23.5” (60-63 cm/23.5 - 25”)

Yarn:
Any Worsted yarn that has a tension of 18x24 for 10cm will do. I used Sublime Extra Fine Merino Wool Worsted
MC - up to 50g (50g) 50g (60g) 70g (80g) 90g (100g)
CC - up to 10g (10g) 10g (10g) 20g (20g) 20g (20g)
SC + pom pom - 50g (50g) 50g (50g) 50g (50g) 50g (50g)

Gauge:
18 sts and 24 rows = 10 cm in stockinette

Needles:
4 mm (US 6) circular needles 30-40cm (12-15”) or longer for magic loop for smaller sizes
4.5 mm (US 7) circular needles 30-40cm (12-15”) or longer for magic loop for smaller sizes