Honestly I pick the pinkys up day 1 or day 2 (whenever I notice them) and I check them all olut to make sure theres no serious deformities or anything.

The mother didn't kill any of them. I havn't been breeding mice long so I have only done this with 2 litters so far, but none of the babies were killed from it.

My first litter was 10 babies and the mother ate 1 right after she gave birth to it. My second litter is 11 babies but the mother hasn't ate 1 or acted strange towards them at all.

I wouldn't recommend to pick them up this early, but I did it with 2 litters already and had no problems at all. Just make sure your not wearing some weird perfume or have any kind of strong odor on your hands.