@neologist,
A fetus is not a "Baby", and not guaranteed viable. Hence you don't have an actual baby until it is born and viable. Essentially don't count your chickens before they hatch. Even in religions in Mesopotamia long ago, didn't consider a child until it took it's first breath, and that was known as the "Breath of Life". It wasn't till much later that the idea of being with child was associated to finding out one is pregnant.
Regardless however, we cannot classify a fetus as a baby, but rather that which has the potential to become a baby. Hence it is a potential baby in the making. Lastly, when can we differentiate a body of cells from the emergence of person-hood? Well, I would argue when the brain has become viable and higher order brain functions emerge usually after 27 weeks, or when consciousness may first begin its emergence.
Otherwise an abortion is no different than you killing off sperm cells, egg cells, or scratching your face and killing skin cells. Hence all of those are also potential babies as living cells. Though I do wonder how smart some people are when they argue that life begins at conception since sperm and egg cells are living cells. And you don't see them all to concerned about killing any of those off. Hence to them, male masturbation, a blow job, or having a period ought to be considered infanticide...., or simply murder. O.o
