It’s possible to pass out during labor, but it’s a completely unexpected labor complication and not to be accepted as normal.
Reasons you may pass out during labor could include having low blood pressure, too much blood loss, a seizure, a stroke, or amniotic fluid embolism (when amniotic fluid enters your bloodstream). These are all complications of labor that your healthcare team will identify and address if they happen.
You may also experience sheer exhaustion simply from being in labor, and that may make you feel like you're going to pass out. It’s expected that you’ll be alert and responsive both during labor and after the delivery, but if you do pass out, then it’s time for your care team to figure out why and address it if a complication has occurred.