Regardless, we won’t find out if we don’t try and we won’t try if the ethical framework within which we work tells us that losing the baby is an ethically acceptable outcome (as opposed to an unacceptable, but unavoidable, side effect).
But I would point out one thing. While you are focusing on preventing the death of the baby in this case, keep in mind that we've already come a long way in that just a generation ago, both baby and mother were doomed. Saving one life in this scenario is significant.