http://www.mangago.me/read-manga/bambi_to_dhole/
http://www.mangago.me/read-manga/yamamoto_zenjirou_to_moushimasu/
http://www.mangago.me/read-manga/beelzebub/ (technically is lol)
http://www.mangago.me/read-manga/momo_lover/
http://www.mangago.me/read-manga/kyou_mo_uchi_de_machi_awase/
http://www.mangago.me/read-manga/ouchi_e_kaerou/
http://www.mangago.me/read-manga/baby_kokoro_no_mama_ni/
http://www.mangago.me/read-manga/gakuen_babysitters/
http://www.mangago.me/read-manga/mikado_no_shihou/ (may potentially be)
http://www.mangago.me/read-manga/winter_woods/ (he's a child in an adult body. His reactions are so childlike (and genuinely so!) it's so cute. Idk if that fits your taste, tho)
Hi everyone.. I'm craving for manga about having a baby or raising child or anything including taking care of child. I've read ufo baby, life so life, usagi drop, aishiteruze baby, and romantica clock (the main character has a sister and she often appears in the story). Anyone have recommendation of similar story?