I can think of these, hopefully you’ll like some (●'◡'●)ノ
https://www.mangago.me/read-manga/the_sacred_serpent_s_seduction/
https://www.mangago.me/read-manga/mauri_to_ryuu/
https://www.mangago.me/read-manga/tadaima_okaeri/
https://www.mangago.me/read-manga/kedamono_arashi/ (The Top here is a jerk at first but he gets his ish together, I promise)
https://www.mangago.me/read-manga/kiraide_isasete/ (tw: bottom was sa by someone (not the ml) and it is kind of graphic, but the ml is nice. Also 2nd tw just in case - they are not so apart in age, I think 3-5 years?, but the top is in High school so, ignore this one if that is a no no)
https://www.mangago.me/read-manga/petit_mignon/ (tw: furries)
https://www.mangago.me/read-manga/oh_my_hero/ (Not omegaverse, but cute child)
https://www.mangago.me/read-manga/ibitsuna_bokura_no_katachi/ (A bit angsty, but quite Sweet)

Hi!! So im looking for some BLs that are either omegaverse or like normal that have kids in em like either the main couple has kids / adopts them or something like our sunny days yk? Preferably if the kids are apart of the story aswell but if not that's okay! Doesn't have to be a green flag bl but id like those cause It makes me happy lolz