In which position to give birth?

Body: 

Someone advised on all fours or lying on the side but certainly not squatting. Any advice? Dealing with a slight uterine prolapse.

Mary Jane, that's a pretty big question with no simple answer. You might want to search the P & P forum view, and/or put some search terms into the box at the top left of this page to look for existing discussion threads. We have lots of experienced moms here. - Surviving

I guess this is a very personal decision and perhaps you have time to do a bit of research. Firstly, not taking prolapse into account, have a look from just the angle of making the birth as easy as you can. These studies might facilitate you in this:
http://summaries.cochrane.org/CD003934/mothers-position-during-the-first...
and they have a similar article "Position in the second stage of labour for women without epidural anaesthesia"
Gupta JK, Hofmeyr GJ, Shehmar M
Published Online:
May 16, 2012
http://summaries.cochrane.org/CD002006/position-in-the-second-stage-of-l...

To summarize these seem to be the main advantages of upright births:
“more efficient contractions, shorter labour, better oxygenation of the baby in the mother’s uterus, as the vena cava vein and aorta are not compressed by the pregnant uterus, increased pelvic diameter, especially in positions such as squatting, less maternal pain, greater satisfaction, fewer forceps, vacuum births and episiotomies."
NB squatting is not always feasible if you are not used to squatting.
From a prolapse point of view making the birth easier is probably the best route to follow.
Good luck