Oh hun, don't worry, the reusable thing takes a bit of trial and error but it's so worth it!
We use Mios, and at 8lbs 7oz my son wasn't in them yet, they were too big around the legs. Also, I found that I had to fold a part of the cloth nappy down first, making it shorter, before folding into thirds. The Size 1 Mio nappies just don't fit well enough inside the newborn size wrap using the 'conventional' fold, and so there's leakage problems. I think Jak went into them at about 6-8 weeks, at 4 weeks he definitely wasn't in them yet.
There is light at the end of he tunnel - we're still in them now at 12 months and I haven't bought a disposable since Easter. They do take some getting used to! Sorry, I can't comment on any of the other sorts of nappies as we don't use them, but HTH x x x
If the other EmilyB reads this, can I have my username back please?