Final answer:
This passage is from 'The Great Gatsby' and highlights Gatsby's desire for family and belonging.
Step-by-step explanation:
The given passage is from 'The Great Gatsby' by F. Scott Fitzgerald. It describes a scene where Gatsby and another character lean down to greet a child who approaches her mother. Gatsby seems surprised by the child's existence, indicating that he may not have believed in it before. This passage showcases the theme of Gatsby's desire for family and a sense of belonging.