I just saw a pic of a NB that was about 8 1/2 pounds and the BG 3.0 looked like it fit ok, I wouldn't say it was overly bulky
(So it is going to depend on what size bubs you have)
found the thread from Diaper Swappers,
Please, Please, Post pics of Bumgenius Dipes on your LO!!! - Page 2 - Diaper Swappers - Cloth Diaper & Parenting Community