Interesting, over a dinner this week, a friend explained that he thought the core of his anxieties was tied to being the second twin to be born, and has suffered throughout his life from that 30 minutes he was abandoned, separated from his twin in the womb.  I asked if his twin had similar issues and he doesn't, so I inquired why his twin would not feel similarly abandoned, and his response was that his twin was more preoccupied with his explosion into the atmosphere.  Anyway, jury is out on this one, likely forever (and the statute of limitations for saving that particular file may have expired and it got shredded or tossed in the dumpster).