I am using infant pf's with no pins or snappis, just a bumpkins cover. I have been using these for maybe 2 weeks now without one leak. My dd is 8 weeks old and has explosive poos. they occasional get on the cover but have yet to leak out.
The bumpkins covers have a pocket at the top to stuff the excess portion of pf into and I tri-fold it in the middle and spread it out in the back - it works great! I even used this method last night with a doubler and fleece liner with no problems.
I would like to try a snappi down the road when I have the money to spend, but I honestly have no complaints with what I am doing now. I have a few fitteds that I love because they are cute and faster, but I could certainly live without them!
eta - I just looked back and saw that the OP was reffering to a newborn. I didn't cd when she was a new-newborn, so it could be harder with the baby being real tiny and the poop being a bit runnier. It works for my chunky 8 week old though!
If I can answer any Q'a let me know!