My mum had bought me a couple of beautiful 0000 outfits for hospital but they were too small. DS was 10 pounds 3 and quite long. He had one Target 0000 outfit that he wore for a couple of weeks otherwise he was mainly in 000. I gave up on Wondersuits due to his length.

I guess I'm saying that bubs can vary so much in size that it's hard to know. Maybe have just a few things in the tiny sizes as you can always get someone to bring more. I also find the bonds singlet suits, either s/less or s/sleeve to be much better than normal singlets. They're really stretchy and don't ride up as they're fastened at the crotch. I've got a pile of singlets that were just not used.