A sweater for the upcoming autumn, fit for children between 2 and 6 years old

Materials
Needles: US 4 (3.5 mm) knitting needles, US 4 (3.5 mm) circular needle 40 in. (100 cm) long, sewing needle, stitch marker, three buttons 0.65 in (1.5 cm) diameter.
Yarn: ALIZE HAPPY BABY SOFT, 100 g. – 3.53 oz. 330 m. - 361 yds.

Size 2 years
Color A: 56 red, 1 skein
Color B: 556 pinkish orange, 1 skein

Size 4 years
Color A: 55 white, 2 skeins.
Color B: 187 yellow, 1 skein.

Size 6 years
4 skeins of any matching colors, 2 skeins each; domain color A and the other B.