DS1 - we didn't even discuss it - and silly enough I just assumed he would do it - and more to the point he wanted to. He did, wasn't fussed - but I agree with Trillian, doesn't alter the experience of becoming parents.

He also then cut it for #2 and #3.

It's not a big thing in the overall picture, so if he doesn't want to, don't worry about it. Maybe exchange it with, so you get to sleep in every Sunday until the child leaves home ...