You will need

0-3 months (16in Chest) 2 Balls
3-6 months (18in Chest) 3 Balls
6-12 months (20in Chest) 3 Balls
12-18 months (22in Chest) 4 Balls

3.25mm and 4mm Needles
Cable Needle
5 Buttons
1m of Narrow Ribbon
2 extra Buttons for decoration (optional)