I wanted to see the baby...

you can. There’s continuation, and their child grew up already I’ll link here later

Part 2: http://www.mangago.me/read-manga/haikyu_dj_tanoshii_jigoku_wo_irodoru_nara/

Part 3: http://www.mangago.me/read-manga/haikyu_hikari_no_ko_doujinshi/

Part 4: http://www.mangago.me/read-manga/haikyuu_hikari_no_ko_2/

Whaaaaa u so kind