I lurked and searched and couldn't find quite what I wanted so here it goes:
1. Why do you love your flip covers? (I like the idea of it being OS)
2. When were you able to start using them on your NB? ( I want to get a guesstimate so I know how many NB covers to buy. They say they fit at 8lbs, but I doubt it...)
Re: About flips....
I dom't know how well they would do for NB under 12 lbs or so since the leg elastics are looser than some.
MY JOURNEY AS A SINGLE BF-ING, CD-ING, BABYWEARING MOM
I don't love them. I prefer covers with double gussets like, RaR, BB coveralls, Weehuggers, Thirsties, Bummis superbrite. The leg holes are loose and large IMO. I don't like they way the flip insert bunches and shifts around, and they are a weird size over fitteds. They are okay, but not my first (or second) choice.
When they will fit your LO depends on their weight and age. They won't fit a 10 NB, but they probably will fit a 10 lb 8 week old. NB just don't have enough fat on their legs/thighs to fit into OS covers without leaking.