I think that I, if I should decide to have a baby, would go Moto'n'Mama's route. I might stay off the track entirely, just because I am so abysmally bad at it, but I would probably stick to some easier trails. However it doesn't sound healthy to have a special kidney belt made, you wouldn't want your kid to be born with a flat forehead! LOL sorry guess that's not all that appropriate.
Anyway, since I'm NOT having a kid, my opinion isn't all that worthwhile. But I don't know if I could give it up for a full year. I mean once the baby is born, you're not going to *feel* like it for a little while, and then you have a little baby to feed, clothe, change, bathe, etc--where's the time for riding?