Here's why:
* Fetus growth: The developing kittens inside the mother cat add significant weight.
* Placenta and amniotic fluid: These structures also add to the mother's overall weight.
* Increased food intake: Pregnant cats need to eat more to support their own needs and the growing kittens.
* Fluid retention: Pregnant cats often retain fluid, which can contribute to weight gain.
However, the amount of weight gain varies depending on the number of kittens, the mother's breed, and overall health.
It's crucial to monitor your cat's weight gain during pregnancy and consult with a veterinarian to ensure a healthy pregnancy and delivery.