You will need

Cardigan with Picot Edges
3-6mths - 1 Ball
6-9mths - 2 Balls
9-12mths - 2 Balls
12-18mths - 2 Balls

Cardigan with Hood
3-6mths - 2 Balls
6-9mths - 2 Balls
9-12mths - 2 Balls
12-18mths - 3 Balls

Cardigan with Roll Collar
3-6mths - 2 Balls
6-9mths - 2 Balls
9-12mths - 3 Balls
12-18mths - 3 Balls

3.25mm, 3.75mm and 4mm Needles
Cable Needle
4 (5 : 5 : 5) Buttons
4 (5 : 5 : 5) Plastic Press Fasteners for Cardigan with Picot Edges