Do Cats Eat Their Kittens Feces ?...(Coprophagia)

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Coprophagia is the act of eating and ingesting feces. This condition is far more common in dogs, however, it does appear occasionally in cats. There are times when eating feces is part of normal feline behavior. New mothers will often eat the feces of their newborn kittens as part of daily grooming routines.
A "Tom" male cat will normally establish a territory which contains a number of females or female groups, and it is in his own interest to repel other males and to destroy kittens which may have been fathered by another male and which contain the genetic complement of his rival. ... Consequently, he may kill those kittens.
In addition to eating dead or sick kittens (to keep the living area and other kittens free from disease and infections) mother cats will occasionally (rarely) kill and sometimes eat healthy kittens due to stress. ... Cats (and dogs) will also kill their young if they feel stressed and unsafe.
While it may be horrifying to people, cats have different behavior from humans, reproduce in a different way from humans, and survived in that way for a very long time. It’s generally beneficial to cats as a species when they reject certain babies, though at the expense of the attacked kitten.
Coprophagia is a term which refers to consumption of feces. Yes, you read right, eating one's own poop. In dogs, while coprophagia appears to be purely behavioral, there are indeed numerous medical problems that can cause or contribute to coprophagia.