As I have said, the method of the abortion does not affect whether it would be considered murder or not.
Poisoning someone is as much murder as the most gruesome ways of killing someone.
The baby does not know what is going to happen to it. It lacks self-recognition until some point after birth; it doesn't even know it exists (though I suppose I could get existential here and ask who does know that). However, I won't argue that this knowledge (or lack thereof) is, in itself, relevant. Someone who has been hit with a shovel and knocked unconscious would not know if they were killed, either. The point I make is that the fetus lacks any human-like intelligence at all (and for most of the pregnancy, lacks any intelligence). A study that I happened across a while back (unfortunately, I can't find it now, so feel free to deny its existence) stated that chimpanzees were more intelligent than humans during the first few years of life. It wasn't until about 2 or 3 years old where the human children progressed past the chimps in terms of intelligence. I won't use this to argue that newborns might be killed (see further down about where I draw the line), but it does support my previous statement (that the fetus lacks a human-like intelligence).
If I had to draw a line as to what point I feel that it was tolerable to abort a fetus, I would draw it at the point where the fetus could be kept alive outside of the womb. I feel that's the least arbitrary point that I could pick for such a thing; if it can live outside of the womb, its brain has probably developed enough that it can feel pain on some instinctual level.
Actually it did. In the abortion (real) video, the child new what was coming because it felt its fortress being met, and moved around violently, and once it broke it tried its hardest to keep away from the instruments.