When it comes to dramatizing childbirth, there are any number of complications for a screenwriter to choose from. But at the moment, the preferred complication appears to be an umbilical cord that gets wrapped around the baby’s neck, causing a resulting drop in the baby’s heartbeat. That’s what happens to Katherine Heigl’s mother-to-be in one of the final scenes of the current hit “Knocked Up.” But that movie being a sweetly upbeat comedy, the situation happily resolves itself in just a minute or two. The medical crisis is turning out to be a lot more protracted on “Studio 60: On the Sunset Strip,” Aaron Sorkin’s cancelled series that is currently playing out its final episodes on NBC Thursday nights at 10 p.m. In the most recent episode, expectant single mom and network exec Jordan McDeere, played by Amanda Peet, had to be rushed to the emergency room when she couldn’t feel her baby move. An errant umbilical cord proved part of the problem, and by the episode’s end, she was being wheeled into the operating room. Stay tuned. (Gregg Kilday)