Weak or sick:
This may seem cruel but this is the natural selection that governs all species in one way or another.Through powerful sense of smell the cat can be able to detect that the kitten is infected by a virus or misshapenness, she supposes that he can't survive or can contaminate his brothers , the mothers kills his proper babies in order to save the others. In case of having birth of 5 or 6 kittens, the weaker must be eaten, the mommy must be able to feed their kids properly, so she has to keep the strongest ,because having this much of babies may be dangerous for her and them health. Next For the last one
