I'd drive a bulldozer through a crowd of people to save my baby son. I wouldn't hesitate one tiny little bit.
What's worse, going through another pregnancy and another time and resources teaching and caring for a new child, or murdering a truckload of people to preserve the one that already exists? Unless these are exceptionally evil people, the answer should be obvious.
Those aren't accurate descriptions of the options.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.