He could just laugh it off if it was all in good fun. Sometimes, showing that you don't take it too seriously can defuse the situation and keep things light - hearted.
One lesson could be about empathy. The boy, now a baby girl, can understand the experiences and challenges that girls face, such as different social expectations. Another lesson might be about adaptability. Despite the sudden and drastic change, the character has to adapt to a new body, new identity, and new ways of being treated.
One can learn the importance of communication. In a girl fight boy story, often the fight starts because of a misunderstanding. If they had talked it out instead of getting physical, the situation could have been avoided.
Red Sorcery is a famous Chinese novel that tells a story about land, family, history, and human nature. The novel did not explicitly mention the problem of Jiu 'er giving birth to a boy or girl. The plot and characters of a novel were fictional and should not be inferred from the rules and standards of real society. The theme of the novel was about human nature and family. It focused on the emotional entanglements and historical inheritance between family members.
Fujii Iki in the movie Love Letter was a fictional character that did not exist in real life. This character was one of the male and female leads in the movie. In the movie, he was portrayed as a man who had deep feelings for the female lead. However, because this was a fictional character, his gender was not clearly stated.
Kusaku Yugano is a fictional character whose gender cannot be confirmed. In some novels and anime, there were often male protagonists with unknown genders. Therefore, Hisaku's gender could be considered unknown.
We can learn that gender doesn't define ability. In a girl wrestle boy story, the girl often shows that she can be just as competitive and skilled as the boy. It breaks the stereotype that certain sports are only for one gender.
In a classic adventure novel, a girl is part of a group exploring a lost city. One of the boys in the group gets poisoned and becomes weak. The girl, being the fittest among them at that time, carries the boy on her shoulders while they are trying to find a way out of the dangerous place. This shows her loyalty and physical ability.