FJ
I had 20 prefolds, 4 covers and 6 mcns and i survived on those ok.
I found i would change them about 8 ish times a day (less frequently overnight).
And washed 2nd daily.

I do think that 4 covers wasnt enough though with all the poo plosions unless you were happy to wash and dry them at that point in time.. perhaps 6 would have been better.