This scene was really something. We are watching early ER episodes at the moment and the commitment to showing the inside of people's bodies has come a very long way in 25 years.

The rig consists of a gurney with a silicone prosthetic of a belly, legs, and a vaginal canal anchored on top. The actress, seated in a chair directly behind the rig, leans over the prosthetic so that her body aligns with the pregnant belly. Her real legs are disguised by the gurney and other medical draping, and the draping also helps disguise two separate puppeteers who crouch in front of the actress between her chair and the rig. One puppeteer uses tubing to add blood and other fluids at appropriate points during the birth; the other has an arm inside the hollow pregnant belly in order to squeeze the silicone baby out of the vaginal canal.