Mashable claims an OB/GYN, named Dr. Amanda Hess, was waiting to give birth in a Frankfort, Kentucky hospital when another mother nearby was fully dilated and ready to deliver. The other woman's doctor was on the way to the hospital so Hess stepped in and delivered the other woman's baby.
She tells WKYT; “I just put on another gown to cover up my backside and put on some boots over my shoes, to keep from getting any fluid and all that stuff on me, and went down to her room and I knew her. She was just glad to be able to get to push and have the baby out and not have to wait any longer.
Dr Hess gave birth to her own daughter shortly thereafter.