wait

It's cute tho, AND I WANT MORE PLS

maybe it's only to form the bond?? since it's a much bigger deal than being preggy in their universe. idk much, but i've seen a few non alpha×omega pairs in japanese bl and can concieve (ofc some after a LOT of work, lol);

alpha×alpha
https://www.mangago.zone/read-manga/okusama_ha_alpha/

(possibly the bott alpha can concieve?? idk tho, the ending is a cliff hanger and apparently the other alpha is toxic)
https://www.mangago.zone/read-manga/imitation_mate/

alpha×beta
(second pair)
https://www.mangago.zone/read-manga/kashikomarimashita_destiny/

beta×omega
this book

(it's a haikyuu doujin series, but it's really cute)
https://www.mangago.zone/read-manga/haikyu_dj_tanoshii_jogoku_wo_irodoru_nara/

omega×omega
(this is the rarest one. i've only seen it once and it's sumi's parents!)

it's only what i can remember, i'm sure there's more lol (◍•ᴗ•◍)

Yeah but from the reference materials before each chapter, it does say that omegas in this abo universe can get pregnant by an alpha. Each ABO universe differs, I agree. Arghh I want extras and explanations

Kurishimas alpha have big brother right, i guess that's his two kids

Hi if you read the rules from this manga clearly says alphas AND betas can impregnate Omegas in heat
The babies are from Utou (▰˘◡˘▰)
You can see them here.
https://asukanon.tumblr.com/post/635772181998174208/utousumi-baby-twins-rei-boy-and-shizuku