That's why pro-abortion groups can't admit that an unborn child is ever a human, not even up to the day before birth, sometimes not even right after birth.
Actually birth is the point when a the fetus becomes a baby. It's not that pro-abortion groups can not define it, it is that it is irrelevant.
It is not simply a location. It's not as if a full baby magically appear inside a woman the day after conception. The actual person is growing a fetus. The woman is the person.
Assaulting a pregnant woman would be the crime, not a property crime. The discussion centers on the woman who has the baby inside her more than the baby itself.