I used prefolds on DS on and off until he was about 6 months old. After that he was too wiggly and I couldn’t coordinate the prefold in the cover and get them both on his bum. So I switched to fitteds+covers which were easier and now I’m on pockets and AIOs which are even easier still. And he doesn’t have runny poo anymore and we go though less nappies a day, so it all works really well.

I think that leg gussets on the PUL covers are a must for prefolds. You really need them for poo containment (in those first few months) and they help keep the prefold in place.