S= Back length 30 cm, chest circumference 31-37 cm, suitable for weight 1.5-3KG
M= Back length 35 cm, chest circumference 36-42 cm, suitable for weight 3-5KG
L= Back length 38 cm, chest circumference 41-47 cm, suitable for weight 5-7.5KG
XL= Back length 42 cm, chest circumference 46-52 cm, suitable for weight 7.5-11 kg
2XL= Back length 46 cm, chest circumference 52-58 cm, suitable for weight 12.5-13.5KG
