I've tried Bumkins AIO's, but they never fit DS quite right (I think it was the lack of elastic). He was also 30 lbs. and not a newborn so that could be another reason. He had blowouts too and for as long as he wore them I never had a problem. I just used a prefold, but I'm sure the liner would give you similar protection.
Good luck to your sister!
Good luck to your sister!
