Sizes: 0-3 months, 3-6 months, 6-9 months, 12 months, 2T
3, (3, 4, 4, 5) Balls Green Cashmere Elite MC 240, (240, 300, 320, 400) Yards
1, (1, 1, 1, 1) Balls White Cashmere Elite CC 86, (86, 86, 86, 86) Yards
Small amount Yellow for Bill and Legs
5, (5, 6, 6, 7) White Pearly Buttons

Cashmere Elite is gorgeous but pricey. Any DK weight yarn will work nicely, it also looks beautiful in pink or blue. If you want a yellow duck, use orange for bill and legs.