The action of a cat stepping back and forth with its two forelimbs is called cat stepping. Cats will only step on milk when they are very relaxed and feel at ease. When a cat steps on a person's belly, it naturally means that it likes and trusts the person.

Cats stepping on milk is an instinctive action of cats. During the lactation period, kittens will step on the mother cat’s breasts to stimulate the mother cat’s mammary glands to secrete milk in order to achieve the purpose of eating. After eating, the kittens will Produce a strong sense of pleasure. As a result, the kitten has a series of reactions from stepping on the milk to eating and feeling pleasure. Over time, it forms a conditioned reflex of feeling happy when it steps on the milk. Therefore, after cats are weaned, they will still retain the habit of stepping on milk.

In addition, cats’ sweat glands are concentrated on the soles of their feet. When the cat steps on the milk, the body fluid secreted by the sweat glands remains on the human body, and the human body is marked by it. In the cat's world, the surroundings must be filled with its own scent to be safe. Everything marked by its own scent belongs to it, so the person who is stepped on becomes "its person". If a cat steps on your belly, enjoy the intimate interaction with it.