You will need

V Neck Sweater
3-6mths (16in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
6-9mths (18in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
9-12mths (20in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
12-18mths (22in Chest) - 2 Balls of Shade A and 1 Ball of Shade B

Sweater with Collar
3-6mths (16in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
6-9mths (18in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
9-12mths (20in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
12-18mths (22in Chest) - 2 Balls of Shade A and 1 Ball of Shade B 

Cardigan
3-6mths (16in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
6-9mths (18in Chest) - 1 Ball of Shade A and 1 Ball of Shade B
9-12mths (20in Chest) - 2 Balls of Shade A and 1 Ball of Shade B
12-18mths (22in Chest) - 2 Balls of Shade A and 1 Ball of Shade B

Hat
3-6mths (16in Chest) - 1 Ball of Shade A
6-9mths (18in Chest) - 1 Ball of Shade A
9-12mths (20in Chest) - 1 Ball of Shade A
12-18mths (22in Chest) - 1 Ball of Shade A
(Small Amount of Shade B for all sizes)

3.75mm and 4mm Knitting Needles
1 Button
Half a metre of Narrow Ribbon for Cardigan