That depends on the author. In a couple that I’ve flipped through all could give birth it was just harder for beats then an alpha/omega pair. I for got the names but one had two alphas and the alpha gave birth. Another was a beat an omega couple.
Yeah I've seen one where a male Alpha gave birth to his male Alpha's baby. I've seen another one where two Alpha males were able to conceive. And then I saw one where an Alpha butler impregnated a Beta butler. However I've been seeing more and more Manhwas dealing the with subject of recessive Alphas/Omegas. One of them is this series, then there's Heat and Run, and there was another manhwa that stated that a Beta basically had till the age of 20 to have their sex finalized, so they undergo more tests than established Alphas and Omegas. But the thing with this series is that dude just got the wrong result since no one believed he was an Alpha to begin with! lol
Anyway, it really does depend on where the author wants to go with this.
REALLY??? AUTHOR-SAN PLEASE GIVE THEM A CHILD THEN ヾ(☆▽☆)
I really want them to have a child but aren't betas like normal men? They just can't have a baby right? If it was beta and omega then maybe...but i don't think they can have a baby if one of them isn't omega or a woman ╥﹏╥