You will need

Long Sleeved Cardigan
0-6 mths - 1 Ball
6-12 mths - 2 Balls
1-2 years - 2 Balls
2-3 years - 3 Balls
4-5 years - 3 Balls
6-7 years - 4 Balls

Short Sleeved Cardigan
0-6 mths - 1 Ball
6-12 mths - 1 Ball
1-2 years - 2 Balls
2-3 years - 2 Balls
4-5 years - 2 Balls
6-7 years - 2 Balls

3.25mm and 4mm Needles