In reply to ARV77:
I chose Petzl because the tie in point seemed high enough. Some full body harnesses have a tie in which would still go at the top of a third trimester bump, which defeats the object. It also has gear loops which others don't (I have dropped grade but not stopped leading). I looked at the Rock Empire harness, and also an Edelrid (I think) but they didn't look as suitable as the Petzl, even though Petzl is pricier. Had I had more money/time/climbing opportunities I would probably have got the Mountain Mama one, but that would have meant being organised, which I'm not!
I'm fairly pleased with my choice, in that it's been fine to ab in as well as climb, but would have liked to try one made specifically for pregnant leaders as well.