Cats stepping on milk is an action to release stress and relieve emotions. A behavior that often occurs when cats are young. Newborn kittens will use their paws to massage the mother cat's breasts while feeding to promote the secretion of milk. Some cats will retain this behavior when they grow up. This behavior means stepping on breasts when they feel relaxed and comfortable.

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The behavior of a cat stepping on milk is also a kind of nostalgia for its mother. When the cat is very trusting and dependent on its owner, it will The cat steps on the mother's milk, which also treats the owner as its own mother. However, kittens that leave their mother cat just after birth have no such memory, and thus will not behave like this.