Being a live human being means breathing oxygen and a bunch of other internal processes outside of the womb. In the natural world.
No, being a human being is a matter of genetics. That child is a human being without question. A genetically unique individual human. If a pregnant mother is killed two murders are prosecuted. There is no question as to the definition.
As to whether the child is alive - it thinks, it emotes, it has motor control... It reacts to pain, it takes in sustenance and eliminates waste. It is every bit as alive, with more complexity and signature than the bacteria inhabiting the very same space - That bacterium, which you will no doubt recognize as being alive.
If a fetus is not capable of that, I cannot say they are a live human being.
There are creatures living in your body right now.
Okay, what if the woman wants to keep the child and the father wants the abortion? Who makes the final call?
Who indeed. A legitimate test would require a trial and a judgement. Even without the interest of the child. The two parents have an equal interest, and either both should be coerce-able, or both should be able to quit claim, or both should be able to do either.
Certainly it is not right that the woman decides alone.