Measurements
Baby Sizes
0-6 months, 7-12 months, 13-18 months
Finished measurement
43, 53, 63 cm (17, 21, 25 in)
Length to shoulder
20, 29, 37 cm (8, 11½, 14½ in)
Sleeve length
12, 17, 23 cm (5, 6½, 9 in)

Each source has a different choice of recommended yarns. The following is from the Patons version.

Materials
Patons Fairytale DK
2, 3, 5 X 50 gram balls
3, 4, 5 buttons.