Personally, I'd return the NB dipes and hold onto the size 1s. Both DC were out of NB dipes at 1 DAY old. Yep, you read that right. The nurses at the hospital had to go to peds and get size 1 diapers for our kids. If you are delivering in a hospital, you'll probably get a bunch (we got a whole bag of size 1) of dipes to take home. When you're done with those, if you still need NB, send out DH, or take a trip to Target to pick up another bag.
Sarah
Mom to Alex (2002) and Catherine (2003)
"The challenge of parenting isn't shaping your kids to be what you want, it's shaping yourself to be what your kids need." - Wellyes