You will need

Striped Cardigan -
0-6months (16in Chest) - 1 Ball of A, B, and C
6-12 months (18in Chest) - 1 Ball of A, B, and C
1-2 years (20in Chest) - 1 Ball of A, B, and C
2-3 years (22in Chest) - 1 Ball of A, B, and C
4-5 years (24in Chest) - 2 Balls of A, B and C
6-7 years (26in Chest) - 2 Balls of A, B and C

Plain Cardigan
0-6months (16in Chest) - 2 Balls
6-12 months (18in Chest) - 2 Balls
1-2 years (20in Chest) - 3 Balls
2-3 years (22in Chest) - 3 Balls
4-5 years (24in Chest) - 4 Balls
6-7 years (26in Chest) - 5 Balls

3.25mm and 4mm Needles
1 Button