Apart from anything else (and they're all valid points, but they've already been made), that's really shitty behaviour. Dude waited until the child was full-term before dropping his little bombshell.

Before or after, dude. By 39 weeks she's likely starting to worry about the actual birth and all the things that can go wrong there, why isn't the baby born yet, all kind of stuff, but no, because you're a performative little bitch you picked the worst time to raise something because you want the child's birth to be about you.

Nothing but contempt for that man.