The new stretchie size 2s are rather wide. They snap down pretty small, but it's the width that would make them uncomfortable on a NB. However, these are my most absorbent big brand nappy. Really I have a heavy wetter, and I can leave them on her for 4 hours!!! I change everything else every 1.5-2 hrs. I love love love these nappies.
If I had it to do over again, I'd buy cheap prefolds or cotton fitteds in the small size for the first 2 months until you can use the bamboozles size 2. I'd buy a whole set of new bamboozles and only have them and blueberry wraps from 2 months on. Seriously, these nappies are fabulous!