Tobias & the bear Size Guide

Measurements (in inches):
6m (fits 3-6 months): 15.5 waist, 13.5 length 
9m (fits 6-9 months): 16 waist, 14.5 length
12m (fits 9-12 months): 16.5 waist, 15.5 length
18m (fits 12-18 months): 17.5 waist, 17.5 length
2y (fits 18-24 months): 18.5 waist, 18.5 length
3y (fits 24-36 months): 19.5 waist, 20 length