I think one sizes are a little big on newborns. Even on my 9lb 8ou'er. I used mostly ME One Size, which I think works better than others on infants because the crotch compresses down better and is less thick. I'm not being clear. I used Kissaluvs 0 the first two weeks, size small diapers after that, and ME after a month, I think.
Good luck!
Good luck!