Gauge 23 stitches and 30 rows = 4 inches in Stockinette Stitch Needle size US 4 - 3.5 mm You will also need a set of 4 double -pointed needles in size US 4 (3.50 mm) You will also need 5 buttons. Rowan used .5" (1.2 cm) buttons with two holes. Yardage 284 - 426 yards (260 - 390 m) Sizes available 0-3(3-6, 6-9, 9-12) months. Finished measurements: Chest circumference: 20(21.25, 23.25, 24)" 50.5(54, 59, 61) cm Finished length: 9.25(10, 10.75, 11.5)" 23.5(25.5, 27.5, 29.5) cm Sleeve length: 5(5.5, 6, 6.25)" 13(14, 15, 16) cm Yarn used: Rowan Baby Cashsoft Merino Shade 121 Nutkin - 2(2, 3, 3) balls