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How to tell if a cat is in labor
Observe the cat looking for a nest.
In the days leading up to queening, a pregnant cat will start looking for a nest, or suitable place to give birth to and care for her kittens. Many cats that are about to give birth will seek privacy, like a closet or other hiding spot.
If you notice yours investigating areas like this, you can lay a blanket or towels down to make it more comfortable. You can also offer your cat a nest, such as a cardboard box.