We planned to use prefolds with Abi but so far she's far too small for any of the covers we have so were looking at buying some new ones this fortnight.

As far as covers go, were looking at bummis original covers. You don't need to use PUL covers with prefolds, you could use fleece covers or wool soakers/longies. The wool will help keep your bub the driest as it let's the moisture evaporate off, the next best is fleece.

Most of my prefolds are cotton so when she starts to wee more I'll start boosting them with some bamboo inserts I have left over from Erin's nappies which are mainly bamboo, I'll just lay them between the nappy and the cover. You can also use microfibre cleaning clothes. Just fold them up to fit, but don't put microfibre right beside your babies skin as it'll dry it out.