You wukk beed 4(4, 5, 5, 5, 5, 5) buttons. Rowan used # BF 147 from Groves and Banks in the UK

Finished measurements:
Chest circumference: 21.75(23, 23.5, 24.25, 25.5, 26, 26.5)“ 55.5(58.5, 60, 61.5, 64.5, 66, 67.5) cm
Finished length: 9.75(10.5, 11.5, 12.25, 13, 13.75, 14.5)” 25(27, 29, 31, 33, 35, 37) cm
Sleeve to armhole: 4.25(5, 6, 6.75, 7.5, 8.5, 9.5)“ 11(13, 15, 17, 19, 21.5, 24) cm

Yarn used:
Rowan Baby Cashsoft Merino
4(5, 5, 6, 6, 7, 7) balls