You can come up with any justification you want, give it any name you want, but what you advocate for is still, in the end, killing a baby which would do perfectly fine on its own in the outside world.

Which is why I would be charged with murder if I go punch a heavily pregnant woman in the gut and kill her child.

I have yet to see a single baby that “would do perfectly fine on its own in the outside world.” A baby needs years of intense care and love to become a healthy person.