Oh moonrise! I have nursed many abandoned kittens over the years and afew that I deliberately took from feral mothers (at least 20 over the past 3 or 4 years) so they would be able to be socialized and given homes through a local rescue group. But most I got were at least two weeks old. It is such a great feeling to care for these little guys and to give them a chance! I finally got all 15 ferals in my back yard (and the woods behind) fixed using the TNR program. So hopefully I will not have any more babies to rescue.
It is time consuming but such a good thing you are doing.