For this pattern you will need:

Sweater and Cradigan

12" Chest - 1 50g Balls
14" Chest - 1 50g Balls      
16" Chest - 1 50g Balls            (And 1 ball needed for contrasting edging)
18" Chest - 2 50g Balls
20" Chest - 2 50g Balls
22" Chest - 3 50g Balls

Needles needed: 5mm and 6mm

3(3:4:4:4) Buttons for Boys cardigan
1 button for girls cardigan.