popsycal, I think the main difference between a fuzzi-bunz and a wonderoo is that a wonderoo is supposedly from birth to potty. I haven't tried them because I assumed they would be bulkier on a newborn than a fuzzi-bunz. The fuzzi-bunz are lovely and slim.
i use either prefolds or fuzzi-bunz micro-inserts. The micro inserts are very thin and I find these fine for daytime. The prefolds are better for night. I did use both a prefold and a booster in the nappy at night but recently forgot the booster and it still didn't leak.
yorkiegirl... would you say the hemp inserts are worth the extra money? I use microfleece which I like as it dries quickly and is cheap.
do the hemp ones dry quick? do they absorb more than the microfleece?