Establish rules and resolutely implement them. Don't make rules without considering practicality and consistency. Let children see the concreteness and regularity of the rules, which will reduce the difficulty of implementation. Good rules include general definitions and operability. Not only should you say that you can't eat too much ice cream at a time, but you should also tell him that he can eat more flavors after not eating too much this time, and what will happen if he eats too much this time. Exemplary role. The acquisition of children's rules and morality does not depend on logic and thinking, but mainly depends on the role of parents as role models. Obeying the rules like children is an example. You have to let him know that everyone is the same and follows the rules, so he/she will try to follow the rules.
Let him/her try to make mistakes. Even the slightest disciplinary education should not take repeated violations too seriously, which is one of the effective ways for him/her to learn, not to mention increasing punishment. In the case of eating ice cream, you should be patient and pay attention to the amount and emotional reaction she eats each time. These things can help you judge whether he/she is learning the rules and find some ways to control yourself from breaking the rules.
Positive feedback. The child is still young, and the limbic system in charge of emotion and regulation in the brain is not well developed, so there will definitely be many emotional reactions when obeying the rules. Please give positive feedback, including positive words and actionable behavior improvement. For example, eating ice cream, after you say the rules, you are watching the children eat. They may not believe your conditions at first, and they are worried that you will take the ice cream away. At this time, you should say: I'm just looking at you, and I'm happy to see you eating. I'm not taking it away. Remember to put it back after eating. You can eat next time.