However, it is quite rare for the mother will eat their kittens. The reason why cats eat mostly like their kitten is born unhealthy or stillborn it is more common in domestic cats than in purebreds. They do commonly eat the placenta of their kittens and this is completely normal behavior.
It's a rare act for a mom cat to eat her kittens. Usually, they do eat the placenta which is completely normal behavior. However, a cat can eat her kittens if it's severely malnourished, or underweight.