Hi all, I'm due in a couple of weeks, so trying to get prepared- just need a little bit of heap. Going to use disposablesfor the first couple of weeks. Have bought 5 bumgenius from Mothercare to start off with and see how I go- not sure if they are 3.0 or not? Do I need disposable liners with these? Also should I soak them before washing and if so what do I soak them in? Many thanks!!