Impregnant Omega (Yaoi)

I'm curious about some omega man get pregnant how he give a birth? It's like a mother give a birth?
And more importantly WHERE THE BABY COME OUT OMG (╯°Д °)╯╧╧
From his ass???

And I read many manga about Omegaverse but the story tells many different facts about Omega in heat and Impregnant.
Is it true if Omega after give a birth his life became shorter and his body kinda fragile?

I know it's not real but I just curious with this things.

*CMIIW cause I know I not fluent in english*
Thanks ( ◜‿◝ )♡