Tadaima Okaeri, it has an anime too
Boku no Papa to Papa no Hanashi is specifically about taking care if their child.
This section has that with both guys but in the later chapters:
Kiraide Isasete
The ones below are mostly one parent/guardian (not both) bls taking care of a child (usually bc they didn't get together yet):
Our Sunny Days
Sorenari ni Shinken nandesu
Kekkon shite kudasai
Koishite Daddy
https://www.mangago.zone/read-manga/peach_and_her_papas/
This was so cute
childcare list
https://www.mangago.zone/home/mangalist/1455680/
tysm for all the recommendations!
looking for bls with the main leads raise/take care of a child?? any is fine