This pattern is Design #1 in Cleckheaton Book 951, and the Cocoon version is also in Knit Simple Magazine Fall 2007 as Design #29.

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

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

OR

Merino Bambino (25gm balls)
Jumper: 3 / 4 / 4 / 5
Hat: 2 / 2 / 2 / 3
Full Set: 5 / 6 / 6 / 7

Also required:
spare needle
buttons (2 for newborn & 3mth sizes, 3 for 6 & 9 mth sizes)
wool needle for sewing seams