Thats the key word Noah, yet. They will, if they aren't killed before being born.
Infants don't have a concept of object permanence, they don't understand if an object is hidden that it's still there... can we kill them too? It was okay to kill them just a few months ago, right?
You are suffering from the same flaw in perception of time as I mentioned before -- that child WILL have a brain, and would be born, or at least have a chance at being born IF the procedure was not performed. The only difference is the position in time... which is just another dimension like space, only our perception varies. If you apply this universally you can say it's okay to kill people south of the equator but not north of it... as they are separated by a certain measure in a certain dimension. NO different in objective reality than a separation in time, other than how we perceive and experience it. And yes, I consider this point very important for understanding REALITY as it IS and not how someone FEELS that it is.