But what's the cutoff? In some states there is none, abortion can legally take place after birth. In others it's 3 months unless the planned parenthood "doctor" (getting payed 2 grand to kill the baby) signs a piece of paper saying it's in the best interest of the mother. Then suddenly it's 9 months and 1 day again.
So since we don't have a hard cap on how old the baby can be (before we decide it's human...) and we don't have any reliable science on how old a baby has to be to feel pain: we are just the evolutionary "scientists" from the 1800's debating whether black slaves should have human rights or not, since they were "half monkey."
If we don't know? We must error on the side of a baby being a human.