I almost always had leaks from disposable nappies. If it wasn't from up the back it was out the leg

You might have to try a few different types. I found snugglers to be good or the baby love ones. Just get the small packet to be sure.

I know of some who use covers over sposies and that helps to at least stop it from getting onto the clothes.

Cloth nappies are great. One reason I went to cloth was due to this leaking thing. I reccon I was washing less by the time I factored in a couple of changes a day for bub or myself and the bedding. My final straw was a comlete bub and bed change at 2am due to poo leakage!