I want to know which diaper cover pattern SamiPolizzi used as well! I ended up loving the Curly Purly Soaker pattern when I was pregnant with DD, and I made many of them in various sizes. I plan to use them again this time. I love the high rise, short rows in the bum to add space for more diaper in back, and the ribbed leg cuffs with that pattern. I also had fun trying different yarn types and cute ribbed patterns, and found that the pattern is very very flexible/adaptable.
I never had huge much success converting that pattern over to work as longies, though. I'm still in search of a perfect longies pattern for knitting!
Here's a photo of my newborn sized knit covers (all using the pattern I linked to below, but I'm horrible about making modifications without taking notes, so each soaker is a little different). The purple longies use the curly purly pattern, but I just kept going with the legs in stockinette stitch and finished them off with a ribbed cuff that can be rolled up. The other purple one is an attempt at a rolled cuff instead of the ribbed cuff. DD ended up being a chubster from early on, so the rolled cuff did NOT work as well for us (too tight). I DID like the ribbed crotch addition, though, and ended up doing something similar when I knit up soakers in larger sizes. Ooh, and the green one has an extra knit layer in the "wet zone". This addition honestly would have been more beneficial in a larger sized soaker. In my experience, newborns aren't likely to pee through a diaper enough to need such a heavy duty cover. I find that I learn something new with each soaker I knit, so it's fun to constantly modify 

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