Stinkerbelle, I agree with your post about very thin women, at least the ones in hollywood, having issues during pregnancy. I know Courteney Cox is so thin, and I just wonder if that had anything to do with her infertility. I also saw that Kate hudson gained 75 pounds, and she was rail thin.
That being said, Gwyneth Paltrow seems to be doing alright, and she was pretty thin.
I guess just like everything else, it depends on the person, however i'd imagine that a 5'6" woman who weighs 110 will have a major change to their body when they get pregnant. I'm sure the body goes into conserve mode and saves every pound it can.