How would we legally define this?
The baby isn't a person when it's 23 weeks, 6 days, 23 hours and 59 seconds old but when it's 24 weeks old, in that magical second, it became a person.
It's not ideal, but it's one solution that is already used the world over for anything age related - being able to drive, drink, get married, join the military, etc.
Yes. You're allowed to kill people in Afghanistan when you're 18 years old but you can buy a beer when you're 21.
As horrible as these are, they usually won't end human life (unless they die in war, which is rare for US troops).
Abortion will.
How do you deem a cortex developed?
There has to be a split second between "developed" and "undeveloped". There has to be a second between those two frames.
It's undeveloped at 24 weeks and 2 days and 50 seconds but it's developed at 24 weeks 2 days and 1 minute?
Can you not be a person at one second and magically become one the other?