for us it was a bimble size 0 or size 1 . i can't remember which. with a rikki wrap. but he had outgrown it by the time he was 2 weeks old. i think for a new baby i would either use a mixture of the few size 1 nappies i didn't sell and dispos or just dispos. my son outgrew the size 1 nappies by about 8 weeks . if the second one was the same i don't think it's worth buying loads of tiny nappies for a few weeks.
Lily's first ever nappy was a natural coloured bbb. I thought it was so soft and lush and she had a boring matching white bbb pul wrap (I bought a trial day pack). They have always been our staple night nappy since then.
For the next one I have no idea although I would love to see them in a teeny tiny fuzzi (I love them and soooo reliable).