That's a different scenario, of course he should be there if his wife ( this is he gf though) has cancer or if it's a high risk pregnancy.

But as far as I've heard this is a routine pregnancy. Women have babies all the time with out the Dad present.

He has a particular skill set that is needed especially by his employer on this special day. He should go the work.

The baby will not even know who he is. As long as he's there for the rest of his child's life he'll be a good Dad