Why did the narrator decide to teach doodle how to walk in The Scarlet Ibis?

In "The Scarlet Ibis," the narrator decides to teach Doodle how to walk out of a mix of pride and a desire for normalcy. He is initially embarrassed by Doodle's physical limitations and feels a strong need to prove that Doodle can be like other children. Teaching him to walk becomes a way for the narrator to assert his own identity and hopes for Doodle, reflecting both his love and his selfishness. Ultimately, this decision sets the stage for the story's tragic events, highlighting the complexities of sibling relationships.