Uh, are you sure? Because my entire life I've learned and been told that the baby *must* turn head first in order for it to be safe for the mother to deliver via birth canal. Feet-first = possible risk of death by hemorrage for the mom, because the female body isn't designed to deliver a child that way.

I'm a ranch kid, have been at many calvings, situation is a whole lot like with humans. The biggest reason that it's bad to go bass-ackwards is because the baby is very likely to die. It's not really good for the mother, either, but "possible...death by hemorrage" is there with all births. Much more mildy, with any activity in that area.