Well, I'm pretty sure a good definition for alive is having brain functions, so since we need to draw lines, let's draw it at brain waves. All bets should be off for health of the mother, though that should be defined as a clear and present danger to the mother's life or health. Convenience or lack of responsibility should not be listed as a "danger."

Alternatively, each state could be allowed to set a definition of alive, since that's none of the federal government's dang business.

Adrian