To fit:
age: newborn / 3mths / 6mths / 9mths
chest: 35 / 40 / 45 / 50cm
sleeve length: 11 / 13 / 16 / 19cm (approx)
head: 30 / 35 / 40 / 45cm

Yarn Requirements:
Cocoon (50gm balls)
Jacket: 2 / 3 / 3 / 4
Hat: 1 / 1 / 1 / 1
Full Set: 3 / 4 / 4 / 5

OR

Merino Bambino (25gm balls)
Jacket: 4 / 5 / 5 / 7
Hat: 2 / 2 / 2 / 2
Full Set: 5 / 6 / 7 / 9

Also required:
cable needle
3 stitch holders
4 buttons
wool needle for sewing seams