I enjoy reading stories that include familes and kids. Babies are fun and reading or writing about your otp taking care of a baby is just too cute. But some stories has so many inacurate or impossible infant behavior that it's just completely hilarious ! 

so to make fanfics that include babies more real you should totally watch those youtube videos :

http://www.youtube.com/user/bobaepapa/videos

 this Korean dad takes video of his kids 

plus they are really really cute and fun to watch ^^