I had 19 nappies for a full time stash for Scarlett (yeah, 19
) if i were to do it again i would aim for 25-30 but i wouldnt have many more than that as its a waste of money given how quickly they grow in those early months. Better to save your money and buy bigger sizes too for baby to grow into, or just save it until new nappies are needed.
As for hosp, dont tell them - just take in a couple of wetbags and get DH to do it. Make it easy, leave step by step instructions on how to wash them, leave everything out so he can find it and just rotate bags with him as he visits (if you have to stay in)
Enjoy building your stash, if i were to have another now i think i would still have some SBOV NB as theyre just sooo teeeny but the rest would, without a doubt be fancy fitteds and wool - tho, i would def have some wraps too as i remember our wraps saving her clothes from a few explosive BF poo disasters as things got going LOL