You will need

Cardigan
0-6mths - 2 Balls
6-12mths - 3 Balls
1-2yrs - 3 Balls
2-3yrs - 4 Balls
4-5yrs - 5 Balls
6-7yrs - 6 Balls

Waistcoat
0-6mths - 2 Balls
6-12mths - 2 Balls
1-2yrs - 2 Balls
2-3yrs - 3 Balls
4-5yrs - 3 Balls
6-7yrs - 4 Balls

3.25mm and 4mm Needles
3.25mm Circular Needle
4 (4 :4 : 5 : 5 : 5) Buttons each for Cardigan and Waistcoat