I was really disappointed with the fit of the nappies I bought for my son.
He was 8lb 9oz at birth so not enormous but nothing seemed to fit him very well.
He wasn't particularly chunky then either but a lot of them didn't fit round him despite being sold as suitable for his weight. Bimbles in size 0 and size 1 were a terrible fit on him. They were way too small and would never have fitted him up until their guide weight.
We used little lambs for a while but again he grew out of them way before he should have done really. The elastic was a bit tight on him so in the end we ended up using disposables until I could find something to replace the little lambs. Used tots size 1 for a bit but again not a brilliant fit on him. We had no end of leaks round the legs.
We now use pockets the whole time and haven't looked back. If I did it all again I think I would use pockets from birth.
All in all I've been disappointed with the fit of fitted nappies this time round (used them really successfully on my daughter) but as they say babies are all different shapes and different nappies suit babies differently.
I would be very careful what you buy though - there seem to be an awful lot of nappies out there which are supposed to last a lot longer than they actually do.
I ended up with more nappies unused than we actually managed to use which annoyed me. Hey ho. At least he's in cloth now.