Jess, just to be different, Jack was 7pd8oz and went straight into 000. Then Tom was 4 weeks early and 6pd 8oz so needed 00000 but we borrowed these from a friend who had had a very premmie baby. So you might not need anything smaller than 000. Maybe just stick with what you have borrowed and see what happens. If you do end up needing more small ones, I'm sure a family member or friend will pop out and pick you up some.