You might end up getting dipes from
the hospital too I think they use mostly size 1. I'd keep them for now, but don't open them in case you need to exchange. My dd used NB for 34 wks, then moved to size 1. This kiddo we are planning on cloth dipes, but I still have a pack of NB, 1, and 2 in the closet for "just in case" situations.