Medium:
Top: 0-2 years
Swim Diaper: 0-2 years
Weight: 10-40lbs
Waistline: 26 cm (10.2in)
Top Length: 24.5cm (99.6in)
 
Large:
Top:0-3 years
Swim Diaper:0-3 years
Weight:18-55lbs
Waistine: 27 cm (10.6in)
Top Length: 26 cm (10.2in)