You will need 3 buttons approximately 3/8-1/2" (11 mm). Finished measurements: Chest circumference: 20.5( 23.5, 26.25)" 52( 59.5, 66.5) cm Yarn used: Rowan Baby Cashsoft Merino A. 102 Cream - 1(2, 2) balls B. 108 Sea Green - 1(1, 2) balls C. 126 Puddle - 1 ball for all sizes D. 123 Pickles - 1 ball for all sizes E. 122 Piglet - 1 ball for all sizes F. 104 Taupe - 1 ball for all sizes Gauge 25 stitches and 34 rows = 4 inches in Stockinette Stitch Needle size US 2½ - 3.0 mm US 3 - 3.25 mm You will need the following needles: 1 pair both US 2.5 (3.0 mm) and 3 (3.25 mm) Set of 4 double pointed needles in both US 2.5 (3.0 mm) and 3 (3.25 mm) Circular needle in both US 2.5 (3.0 mm) and 3 (3.25 mm - no longer than 16( 16, 24)" Yardage 710 - 994 yards (649 - 909 m) Sizes available 0-6 months( 6-18 months, 2-3 years)