???

http://www.mangago.me/read-manga/hohoemi_no_nichijou/ here you got a very cute baby but the story is nothing like dekichatta danshi… (first story)

well, i only know one good yaoi manga with a really little baby:
http://www.mangago.me/read-manga/sukijanai_kedo_aishiteru/

but maybe the "baby" can be a little older already?
then i`d recommend these:
http://www.mangago.me/home/mangalist/7549/

i meant one other (!) good yaoi manga with a baby since Dekichatta Danshi is one of my favs...