Sizes with measurement at underarm (cm then inches)

Child 1 year 55 (22), 2 years 62.5 (25), 4 years 70 (28), 6 years 77 (31) , 8 years 85 (34), 10 years 90 (36)
Adult medium 115 (46), large 122.5 (49)

Yarn

Single colour sweater

4 (5) (6) (8) (9) (11) (17) (17) 50 gram balls of Extra Thick Cotton
2 (3) (3) (4) (5) (6) (9) (9) 100 gram balls of Extra Thick Wool