On the other hand, stealing infants is also a crime and should be punished. Social harmfulness of behavior is the premise of criminal illegality of behavior, and criminal illegality of behavior is the concrete manifestation of social harmfulness in criminal law. Article 3 of China's criminal law stipulates: "If the law expressly stipulates that it is a criminal act, it shall be convicted and punished according to the law; If the law does not clearly stipulate that it is a criminal act, it shall not be convicted and punished. "Therefore, only when an act is socially harmful and violates the relevant provisions of the criminal law can it be investigated for criminal responsibility, otherwise it will undermine the principle of socialist legal system and the principle of legality in criminal law. In this case, if the defendant steals a baby for the purpose of selling, according to Article 240th of the Criminal Law, if he steals a baby for the purpose of selling, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated; If the circumstances are especially serious, he shall be sentenced to death and his property shall be confiscated. It can be seen that crime of trafficking in children has clearly stipulated the act of stealing infants and young children, and the defendant's behavior is obviously illegal and should be punished. private