Or One Life?
I thought the OL was quite 'wide' in the crotch and would be bulky on a newborn. But when I got a size 1 Sandy's I don't think there was much difference.
Baby is due in 4 weeks and will probably be around 10lb (last one was!)
I can't help thinking I'd be better off with the one size instead of having to buy bigger as baby gets older...