7 Reasons for this Behavior :

1. It’s Unhealthy
2. It’s Stillborn
3. The Litter Is in Danger
4. A Long Stressful Labor
5. Inexperience
6. Malnourished
7. It Doesn’t Recognize the Kitten

How Can I Help Ensure My Cat Doesn’t Eat Her Kittens?

The best way to prevent your cat from eating her kittens is to keep her healthy when she is not pregnant. When it’s time to give birth, provide her with a private area away from traffic and noise. Resist the temptation to interfere in any way, so you don’t make her feel that the litter’s safety is compromised, and there will be a low risk of her eating the kittens.

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