If I remember rightly Finn is much smaller than Grace and she still fits fine in her size1 day hollow oak so I'm guessing it would swamp him If you PM Emma S she should be able to provide you with the actual measurements though...
t has a size 2 hollow oak, i wouldn't say it swamps him although the size one is a trimmer fit for sure, we have a few of these too, t is 12 and a half pounds, and kinda weeny, but then we also use large wnnn on him for nights, tweaked with extra snaps would fit him a dream
Findlay wore a HO size 1 night nappy last night that I got preloved from Fluffy Cabbage and he's got growing room in it on the tightest snaps (he's about 8lb 11/12). Guess I'll be waiting quite a while before I can look at size 2 then!
Charlie wears a size 2, coz she needs loads of boosting in there too. size 1 wasnt big enough. she has a 15-16" waist,long rise and skinny legs. 15lb. yeah its a bit big but i'd rather that than too small! (the legs are still tight enough tho )