The benefits to using the trifold is that it is easy to do, and you can have another diaper cover waiting & a prefold already folded into it. The downsides to using a trifold is the first 6 weeks the infant have "explosive" poops ( see poop video in our FAQ section). When infant has an "explosive poop" it will run onto the sides of the diaper cover. Trifolding works best for infants/babies when the poop stays in one spot a bit better ( ie 12ish pounds). Both the newborn cover & one size cover have snaps on the front to snap down to make the covers fit smaller. Make sure when placing diaper cover on baby that all diaper ( prefold) is tucked into the diaper cover. If any white diaper is sticking out, that is when you will get wicking ( leaking onto sleepers).