The “abortion after birth” statement was kinda weird. I’m aware of partial birth abortion, but I’m not sure that’s what he was talking about.
It wasn’t. He sourced the statement to the former governor of Virginia, who Trump quoted about setting the baby aside (That, and the case of the father being arrested protesting a school-board coverup of his daughter, and later another girl, being raped in the restroom by a trans kid, were major parts of that Governor losing his election). There were also bills put forward in California to allow abortion up to a week after birth, but AFAIK, those went nowhere - though even presenting them is pretty appalling.
Northam was giving a hypothetical example of what could happen if a mother whose fetus had severe deformities, or wasn’t otherwise viable, requested an abortion while in labor.
And yes, Northam is a piece of absolute trash, but context is important. The leftist democrat stance on abortion is disgusting. Trump has said his cutoff is 16 weeks and I agree with that.