Omegaverse with babies

try http://www.mangago.me/read-manga/keeper_of_the_pearl/

Here are a few titles I can recommend if you haven't read them yet:
http://www.mangago.me/read-manga/love_is_an_illusion/?l6G4
http://www.mangago.me/read-manga/kashikomarimashita_destiny/
http://www.mangago.me/read-manga/kedamono_arashi_kiss_me_baby/

Not their own family but the couple deals with a lot of kids:
http://www.mangago.me/read-manga/sensei_no_sensei/