Fox holding its cub with its mouth. Fox cubs are born in the spring. They are born blind and deaf, weighing about 100 grams, with fur that is initially dark grey. Within the first two weeks, their fur changes to dark brown as their ears and blue eyes begin to open. At one month old, red fur starts to appear on their faces, and their eyes change colour to amber. As they take their first steps outside the den, their muzzles turn white. By six to eight weeks old, their dark fur fades to red, and they are weaned from their mother. They start to become independent and spend time exploring outside the den.