Wizard 'Perfect Size' wraps come in 4 sizes (xs,s,m,L). They give a very good fit at each stage as baby grows but, as you'll need 4 sets of nappies, they do cost more than adjustable wraps.
Small - 10-18lbs
This waterproof cover is part of the Wizard Duo All-in-Two system. Used with the Wizard Duo insert it provides the performance of a 2-part nappy system, with the convenience of an all-in-one nappy.
Here's how it works:
1. Popper the absorbent insert into the waterproof cover.
2. Place the nappy on baby.
3. Once wet or soiled, remove Duo insert from the cover and popper in a clean one. You can use the cover up to 3-4 times before washing.
The cover is 100% polyester. They are the same fabric as the Motherease Airflow and Rikki wraps.
The inserts are available in Stay-dry polyester and bamboo. See for information here.