When a boyfriend shows his immature side, as girlfriends, we have a responsibility to guide him in a more mature and rational way. By respecting others, providing role models, giving positive encouragement and feedback, promoting personal growth, giving the right guidance, giving responsibility and self-discipline, and seeking outside help when necessary. When a boyfriend exhibits childish behavior, here are some things we can do to help him grow and improve. 
1.High respect for others:
Childish behavior often manifests itself in a lack of respect and concern for others. As his girlfriend, we can show the importance of respecting others through our words and actions. We can actively model how to respect the opinions, feelings, and privacy of others. When he behaves naïvely, we need to communicate with him patiently and remind him of the consequences and impacts, helping him realize the importance of respecting others for building healthy relationships.
2.Provide role models:
Childish behavior may be due to a lack of mature role models and guidance. As his girlfriend, we can be a positive, mature and responsible role model. We can show our maturity and self-discipline through our words and actions, and respect his growth and change.
3.Give positive encouragement and feedback:
Childish behavior is often closely related to emotions such as low self-esteem, anxiety, and lack of self-confidence. When he shows mature and responsible behavior, we should give him positive encouragement and affirmation in a timely manner, so that he feels that his improvement and efforts are recognized. At the same time, we should pay attention to gently provide feedback on his childish behavior, point out the problem, and give constructive advice and support.
4.Promote personal growth:
We can encourage him to take the initiative to drive his own personal growth. Remind him to learn new skills, engage in meaningful activities, broaden his interests, etc. This will help him develop a higher level of interest and responsibility, and promote his self-development.
5.Make the right guidance:
When he is naïve, we can give the right guidance. Through appropriate communication and explanation, help him recognize the negative impact his childish behavior has on himself and others. Ask him to think about the reasons for childish behavior and help him find more mature practices.
6.Give responsibility and self-discipline:
Childish behaviour often manifests itself in a lack of responsibility and self-discipline. We can give him the opportunity to take responsibility and self-discipline, for example, asking him to take on some family or personal responsibilities, such as managing his own time, completing certain tasks, etc. Through this practice, he will gradually develop a sense of responsibility and self-discipline.
7.Seek outside help:
If your boyfriend's childish behavior seriously affects the quality of life and relationships, we can encourage him to seek professional help. A counselor or psychologist can help him identify and cope with the psychological problems and confusion that lie behind the childish behavior.
In conclusion, helping your boyfriend grow is a long and challenging process. But as long as we guide with our hearts and tolerate with love, I believe that he will be able to become more mature and more confident in our company.