You will need

Sweater
0-6mths - 2 Balls in Main Shade
6-12mths - 3 Balls in Main Shade
1-2yrs - 4 Balls in Main Shade
2-3yrs - 5 Balls in Main Shade
4-5yrs - 6 Balls in Main Shade
6-7yrs - 7 Balls in Main Shade
1 Ball in Contrast Shade for each size

Tank Top
0-6mths - 2 Balls in Main Shade
6-12mths - 2 Balls in Main Shade
1-2yrs - 2 Balls in Main Shade
2-3yrs - 3 Balls in Main Shade
4-5yrs - 4 Balls in Main Shade
6-7yrs - 4 Balls in Main Shade
1 Ball in Contrast Shade for each size

3.25mm and 4mm Needles
Cable Needle
Stitch Holders