Re: Best fit for 6-7 lb newborn
I didn't care for any of the AIO's I bought until he was about 8 lbs or so. My favorites were my fitteds, Goodmama newborn and Graham Bear Wear (Etsy). I also had some Patooshie Pants that my 4 year old used, and they fit very nice, but weren't very absorbent. I didn't care for the Nanas Bottoms newborn fitteds, but I didn't care for them when my 4 year old was a newborn, either.
If I was going to have another newborn, which I'm not, then I would get a full stash of Goodmamas and GBW and covers.
Wife to my Navy doc, SAHM to 4 (11, 8, 5, 1)