Rescuing a kitten is an amazing thing to do. It's a heroic thing to do, and that's how we, here at ICHC, treat such a thing. To rescue a kitten in need is a selfless act, it's something that most people would not even think of doing, and it's pretty much always a good thing. Pretty much always. You do have to be careful. You do have to remember that this kitten that you want to bring into your family also comes from its own family, and maybe - just maybe - there is a momma cat somewhere out there, looking for its kitten.
This is something that we always recommend: if you're rescuing an itty bitty kitten from the street, do stick around for a little while and make sure that you are not separating it from its momma. Now, we don't know if the person in this story did this, but we do know that they did the right thing. This kitten needed help, urgently, and her mom coming back to look for her doesn't change that. It just means that this rescuer may have signed up to adopting 2 cats instead of one without knowing it.
source https://cheezburger.com/38704645/i-rescued-a-lost-kitten-feral-momma-cat-comes-back-for-her-kitten-6-weeks-after-it-was-rescued