What methods are there of killing an unborn baby a day before it would otherwise be born that wouldn't cause massive harm to the mother? What examples of this a

What methods are there of killing an unborn baby a day before it would otherwise be born that wouldn't cause massive harm to the mother? What examples of this actually occurring do you know of? Personally I agree that ethically, intentionally killing the foetus/baby just before birth is not significantly different to doing so just after birth. But it doesn't mean the same legal protections make sense, given the very practical differences between either act. Perhaps the only scenario where they're not so different is where the mother is already dead. That we might need laws against anyone actively killing an unborn baby in such a case (given they'd obviously require active intervention to survive more than a few minutes) seems a little farfetched.