What inference can you make about why the narrator helps doodle learn too walk?

The narrator helps Doodle learn to walk out of a mix of pride, responsibility, and a desire for companionship. Initially driven by a sense of shame over Doodle's physical limitations, he ultimately recognizes that helping his brother achieve this milestone fosters a deeper bond between them. This act symbolizes the narrator's struggle between societal expectations and his love for Doodle, demonstrating a complex interplay of sibling dynamics and personal growth.