We suggest that the AIO nappy snapped down to its smallest size with the Bumbly Booster on top of the pocket. 

Bumbly Booster On Top

As nappy changes for newborns are far more frequent (and small), we find that most of the time you can use the nappy twice; once with the Bumbly Booster on top, and once the booster is soiled, remove it, and you can still use the AIO nappy on its own if the inner booster is not too wet.  This is great in sustaining a full time cloth nappy system during the newborn stage without having to purchase more than our suggested 26 nappies.