I would say it is because there is more room in there after the other bubs. I would think that is the same reason for the lack of ligament pain too. ie: They just don't have to strectch as much therefore aren't hurting you as much. Now I think about it, I don't think I have as much trouble rolling over in bed this time either (not that it's easy )

I hope bubby turns & stays head down for you soon Tanya