LET'S calm down for a moment.
Even if Yuno gave birth in that world, it wouldn't be really him.
After all…
This isn't my physical body, is it?
How could he treat someone else's body so carelessly?
Giving birth was life-threatening!
And, in most Omegaverse novels and webcomics that he had read, male Omegas were always at risk of dying during childbirth.
Why would I subject this poor man to that kind of danger?
"No matter what world we are in, you're just as cruel as ever," Yuno complained to the System. "I can't believe you allowed this soul-switch, or whatever this phenomenon is called, so that you could put me inside a body that could give birth. The Yuno of this world is already living a hard life as an Omega."
Well, he didn't know that because he didn't have the memories of the body's owner.
But he just assumed that life was difficult for an Omega.
He wasn't looking down on them, okay? But as someone who also experienced hell for being a Guide, he could relate.
