From the Knit Rowan website:
Knit this childrens traditional fairisle sweater from ONCE UPON A TIME designed by Marie Wallin using Rowan Felted Tweed. This classic sweater has a fairisle yoke with colourways available for both boys and girls.

THE PDF PATTERN IS FOR BOTH LAILA AND ISAAC

Finished chest width dimensions:
32: 34.5:36:38.5:40 cm
12½: 13½:14: 15: 15½ inches

Yarn information:
A - Maritime 167 or Peony 183
3, 4, 4, 5, 5 skeins
573, 764, 764, 955, 955 yards

B - Seasalter 178 or Bilberry 151
1, 1, 1, 1, 1 skein
191, 191, 191, 191, 191 yards

C - Scree 165 or Frozen 185
1, 1, 1, 1, 1 skein
191, 191, 191, 191, 191 yards

Gauge notes:

• 25 sts and 36 rows to 10 cm measured over stockinette stitch using recommended 3mm (US 2/3) needles.
• 25 sts and 29 rows to 10 cm measured over patterned stockinette stitch using recommended 3¼mm (US 3) needles.