To fit:
age: newborn / 3mths / 6mths / 9mths
chest: 35 / 40 / 45 / 50cm
sleeve length: 11 / 13 / 16 / 19cm (approx)
head: 35 / 40 / 45 / 48cm

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

OR

Merino Bambino (25gm balls)
Jumper: 3 / 3 / 4 / 5
Hat: 1 / 2 / 2 / 2
Full Set: 4 / 5 / 5 / 6

Also required:
2 buttons
wool needle for sewing seams