Sizes:
0-6 months, 6-12 months, 1-2 years, 2-3 years, 4-5 years, 6-7 years

Yarn Requirements: DK weight, 50g balls
Plain Hat: 1 ball all sizes
Cabled Hat: 1 (1, 1, 2, 2, 2) balls
Beret: 1 (1, 2, 2, 2, 2) balls
Helmet: 1 (1, 1, 2, 2, 2) balls

Sirdar: http://www.sirdar.co.uk/designs/babiesDesigns/hatsbooties...