The first 3 months in the lives of kittens are very important when it comes to proper development. During this period the entire litter needs to be with their mother in order to learn the basic rules about how to be a cat. Of course, they can make progress even without their mother, but this is the best option. Their mothers feed them; teach them how to find food, how to walk and run and how to play!
In order to do that mother cats often use their paws to guide their little ones, but most of them including the cat in this video use their vocal skills too.