There are only so many times in your life that you can get away with wearing a garment that is designed to make your butt look big. I don't know how long the window is (3 years? 5 years?), but it's very small. And I think the Peapod should get to take full advantage of it. Hence, the Big Butt Baby Pants.
(Digression: I was at the Gap the other day when I saw the first sweater dress of the year. I love the idea of sweater dresses, but their lack of structure tends to make me look pregnant. I was gazing at the dress longingly when the light bulb clicked on....wait a second, I am pregnant! While that particular sweater dress was not for me, I'm officially on the hunt. I will buy a sweater dress this year and I will wear the hell out of it! But anyway....)
The first pair of these was a little bit fiddly, and I'm not sure I ever got the bit right where the butt panel and the crotch intersect. However, once I got into the rhythm, they were...maybe a half an hour each from start to finish? Not as easy as regular pants (which, to be honest, I'll probably stick to in the future), but not much harder.