I was 17 the first time I delivered a baby, and delivered four more during my career as a rescue squad person, and never ONCE did the mother do her lying in on her stomach, it was always supine or sitting up.

Prostrate means specifically lying on the stomach. There's a way to remember the difference between prone (which is also prostrate) and supine, which is lying on the back. There's a spine involved in the word and the act of being supine.


TEd