I used sposies til 6 weeks and then switched to terry flats/lanolized wool covers. The wool covers are amazing, absolutely no leaks even when she sleeps for 10 hours. No poo leaks either, had heaps of wet and pooey leaks with sposies even with very frequent changing. The wool is nice and dry, smells nice and is easy to keep clean. I think they're expensive to buy, I made mine from spotlight sale wool so they cost about $2.50 each plus a few hours of work. SO worth it.