Small
3.5kg - 7kg

Medium
7kg - 15kg (Depending on bubs Build)
Measurements: Rise 36cms (measured flat) 43cms (Outstretched)Waist 34cms to 50cms approx

Large
10kgs+
Measurements: Rise 45cms (measured Flat) 50cms (Outstretched)Waist 35cms - 59cms approx