Thank you Drishtant! 
The cat in the picture is the one whose observations I’ve made, hence, not the cat who gave birth for the first time. I foster stray cats and help them find owners so the cat(who gave birth for the first time) now has a different owner, hence, I’ve not followed up with her behavior.
As for the previous adult cat duo, when I had them they both showed unusual behavior as my current cat, like, loud meows and one of them even kept shooing the crows away which would roam around her deceased kitten. As of now, one of them has a different owner and the other one passed away in 2016.
Though through these recent observations I’m now keen to know whether the cat who gives birth the first time and does not show the same behavior, does show it during her second or third time. I’ll make sure to post it here if I make any further observations on the same!