Adam *is* still in size 1s, he was 16lb 13oz 2 weeks ago, and if he stays on the curve as he has been he won't be 20lb for another couple of months, and so theoretically still in LL size 1. I'm finding that though they do up fine round the waist, the rise is getting a bit low.
Do your wraps have poppers or aplix? Airflow are the ones with poppers, Rikki has aplix. I have only tried the Airflow, and they do look massive and baggy but Medium fits a 10lb-20lb baby. They're just about totally leakproof because the waist and leg elastic sits a fair way away from the nappy itself, so there's no wicking. Mine do fit over the size 2s but they're a lot more snug on the rise, so I am on the lookout for M/L and L now.