The EW-3 Midwife Droid was an NPC, a medical droid stationed at a hospital on an asteroid called Polis Massa. She seemed to have no experience with delivering human babies, and was disturbingly cheerful about Padme dying as she was giving birth.
Revelation of the Sith Edit
Obi-Wan was with Padme as she was giving birth, assisted by a rather inept EW-3 Midwife Droid. Padme first gave birth to a boy, whom she named Luke. She then gave birth to a girl, whom she named Leia. Padme closed her eyes and stopped moving.
A New Generation Edit
Darth Vader later revealed Vader gained information on the true parentage of Princess from the Polis Massa medical staff after some...persuasion. Given Vader's normal methods of...persuasion, it's at best doubtful if any of the medical staff was still alive (or in the droids' case, still functioning) after Vader's...persuasion.