DH & I had the same argument 13 years ago... he is snipped & wanted his son to be as well. I didn't.

At the time I didn't have a lot of research or reason not to, just that I felt it wasn't necessary. In the end I told him it would be up to him to talk to the doctors, find out all about it, make the appt & hold our son while it was done.

He didn't. And these days he speaks up (albeit gently) against circumcision.

A big part of it for him was holding his baby son... it put a whole different spin on it for him IYKWIM.

I think MissE's approach is a great idea, and I would also suggest if you can both tread gently, agree to disagree just for a bit.... until bub actually arrives... that *might* make the difference as it did for us.
Alot of boys now don't get circumcised, and we came to the conclusion that it will be other kids that will tease each other about their bits being different before his father does. That was our main reason for not getting it done.
Call it a fashion trend XD
I had the same POV.