I don't believe in a literal interpretation but I'll pretend it is to answer. I believe it was just a story to try to explain things.

> do Christians believe that before the Fall, childbirth was painless?

Well,  Eve didn't give birth until after but good question. I don't think we will ever know. Maybe there were slight differences that allowed a painless birth or possibly not being able to feel any pain whatsoever.

> do most Christians see the opportunity for medicated, less painful childbirth as a blessing or as something that goes against God’s will of suffering?

A blessing. I don't think most think it goes against God's plans.

I personally believe they did not and could not have children. And that they could not die.

do Christians believe that before the Fall, childbirth was painless? was there an anatomical difference in Eve’s pre-fall body and post-fall body? do most Christians see the opportunity for medicated, less painful childbirth as a blessing or as something that goes against God’s will of suffering?

Eve, the Fall, pain in childbirth