Fit Guide

At teeny tiny couture we strive to make our products fit true to size. This means, if a baby is of average size for their age, they should fit in the corresponding age range onesie. 

When in doubt, we always recommend you go a size larger because babies are constantly growing and that larger size onesie will fit before you know it!

When purchasing a gift for a new baby, we recommend the 3-6 month size. We've done the leg work for you and surveyed new parents and this is the size they have consistently requested for baby gifts. 



SIZE Weight (lbs.) Body Length (in.) Body Width (in.)
0-3 Months Up to 12 17.5 7.5
3-6 Months 12-17 18.5 8.75
6-12 Months 17-22 19.5 9.75
12-18 Months 22-24 20.5 10.75


SIZE Waist Size (in.)
0-12 Months 14-17
12 Months - 2T 17-20
3T - 4T 20-23