Have you tried BumGenius?
I just ordered my first 3. My DD is only a month old but already pushing 12 lbs. I saw my future and it involved buying every size dipe if she continues growing at this rate. Wanted to try a one-size dipe.
We put her in the BG last night and it was fantastic. The fit was good, and she has really chunky legs but no red marks, no sign she had even had dipe on hardly. Her Kissaluv size Os leave some marks around the legs, but this didnt.
She was completely dry also and all the wetness was contained in the insert. She slept for 6 hours straight. I think this had something to do with being so comfortable.
Another reason I suggest the BumGenius is because the aplix with stretchy tabs is very close to how sposies work. There is a video on their website of someone diapering a wiggly wiggly toddler with a BG and its major selling point for me.
Ive never had a ton of success getting a good fit with snaps. My Kissaluvs Size O seem to fit best with one side snapped further in than the other....which annoys me.
Again, I've only been CDing for a month now as DD is quite young, but she barely moves on the changing table and I find snaps a challenge to get a good fit. I think I will move into BGs for our next dipe and that will hopefully last us the whole time she is in diapers.
Ive heard criticism about the outer layer of the BG (that its too plasticy). It does feel a bit like a shower cap, but its functional and clothes slide over it easily.... Doesn't bother me. Its not the part that touches the baby anyhow.
Also, they have a money back guarantee so you can try it for 14 days and see what you think.
Anyhow, best of luck!
mama to Milena Anjali (4/26/06) and Vincent Asher (4/13/09) ~ married to the love of my life since 2002.