Much of this discussion about when a life becomes viable is quite irrelevant to the real issue. A deliberate smokescreen perhaps?
Babies tend to be aborted when they are several months old.
I'm not sure what the limit is now, but let's say for the sake of argument, that an abortion can take place up to 24 weeks.
Everyone seems to agree that after 24 weeks abortion should not be allowed.
The pro-abortionists need to consider what state the foetus is in at 23 weeks and 6 days. I for one doubt that it is possible to tell the difference between a foetus that is 23 weeks and 6 days old, and one that is 24 weeks old. Despite this, there are many people who would happily kill one, and protect the other.
It doesn't matter what time period you choose, the same argument will apply.
The only way to be sure that you are not killing babies, is to outlaw abortion.