Squidipa, CrystalBoo & Kazbah - Thanks so much for your replies.

I'm just north of adelaide where it is pretty cold and hopefully wet this winter. Drying outside doesn't happen unless we have a good day. I generally only use the tumble dryer on low heat so that sounds like a bonus!

Fitteds with covers and the flats sounds pretty good, I'll just need to work out how to use them best! Where do you normally buy them? Online sounds great but I am such a tactile buyer that I want to read the packet, play with them and stuff before I buy - bit hard to do online...

The one size fits all really sounds like a money saver if it fits from NB to toddler... I might invest in a couple of those.

Thanks again for your help.