What is a fox baby called?

a kit.

A fox baby is also known as a kit or a cub. Kits are born in the springtime and typically live with their parents until the fall when they are old enough to hunt and survive on their own. They are born blind and helpless, weighing only around 4 ounces. They have soft fur that is usually gray or reddish-brown and they become more active and playful as they grow and develop. Kits learn hunting and survival skills from their parents and other older foxes in their family. Foxes are intelligent and adaptable animals, and their kits are no exception as they learn quickly and adapt to their environment.