I am starting to sew a stash of postpartum cloth pads. I am using an envelope/pocket design so that I can change the absorbancy. I have preemie prefolds that fit in well. I am following these directions but made a longer patter that fits my underwear. http://www.hillbillyhousewife.com/sanitarypads.htm
1. Do I need to add a waterproof layer? If so, what is better, felted wool or PUL, I have both?
2. Is 12 a good number?