Ok, so for the first 3 weeks or so, bub will be pretty tiny for shaped MCN. You can buy newborn, but I found them a lot of money for only a few weeks of use. we used Pre-fold nappies, with gorgeous wool covers for the first month. Pre-folds require a little bit of folding, then a snappy and a cover. Its really easy and they dry quickly too. A pack of 12 would be heaps.

Then once bub is a little bigger, you can put them in MCN size small- you can get small fitted nappies and then keep using the same cover from the pre-folds, or you could get All in ones (Baby-beehinds MagicAlls in small would be perfect).

I personally bought 14 Baby-Beehinds one-size-fits all in bamboo as well as some MagicAlls in small and medium and that's what I am still using now (not the small though lol)...so thats 6 months so far. The prefolds I haven't touched since, but I passed them onto another new mummy, so they're getting used anyway.

I hope that helps!