The woman being in labor is irrelevant. It doesn't matter that she suffered through all of that, when you're deciding custody of a child their well-being and future is at stake. I wouldn't shift a major decision towards either side just because one person was a balloon while the other person just had to put up with her mood swings, food cravings, and other irregular behavior.
I mentioned that the mother was crazy. As in threatening her kid to make sure she "behaves." Screaming at the dad for pretty much every reason she could think of. This is an example from within my family. I was actually accused of practicing black magic and attempting to break up her perfect little world. Apparently, that's the only reason I would play with my little cousin.
And saying fathers don't have parental instincts is also discriminatory. There are people who have much higher views of their father than their mother, and it's not that uncommon. They may not pamper their kids or watch over them like a hawk, but that doesn't make them any less of a parent.
Did the father prove evidence of this craziness to the court?