Sizing:
To fit chest measurement
6 mos 17” 43 cm
12 mos 18” 45.5 cm
18 mos 19” 48 cm
24 mos 20” 51 cm

Finished chest
6 mos 19¾“ 50 cm
12 mos 20¾” 52.5 cm
18 mos 21¾“ 55 cm
24 mos 22½” 57 cm