None of the OS/BTP fit Rufus at all well even now at 10 weeks & 13lb
I have also abandoned all pockets & AIO's at this stage as I find they just don't fit well enough to contain newborn poo explosions (ajor leg gap on all we've tried - which is quite a few)... we are in fitteds pretty much full-time, he occasionally wears a WNOS or BBOS but only when I know he has already had his poo explosion for the day
Fitteds are definately the way to go for newborns in my opinion:
You can use pretty much anything so long as you have a good wrap ... leg gussets are a must, Motherease Rikki or Thirsties are the best we've used in this respect, although it's nice to have a XS WN for a pretty one (we had no leaks with these either).
Nappywise I found tots bots & little lambs very good but huge & bulky til he was about 6 weeks old ... if you want to use from birth it's worth getting some newborn specific nappies, but as pp said, preloved is good as you don't have to spend so much for 6 weeks use, I got a mixture of preloved & new (only because i wanted him to have some that were new to him) the best we tried were Muttaquin newborn, Easy Peasy Bimble Sz0 nippa version and of course Swaddlebees OCV newborn.
There is a new shop that stocks all of these if you want to look at them, Kingdom of Fluff ... and you can usually pick these up on the sale board if you keep your eye out .. or post a wanted