FB ?'s

J&B2007

How do I use the elastic sizer? I bought off a bumpie so no instructions on what number goes with what size, if that makes any sense.

heyitsme

Look at the lower left corner of the page:

https://www.fuzzibunz.com/one_size_diaper.php

 

That being said, you can also customize whatever fits your LO best for legs and rise.