“You dream, you. You absolute little dream.”
The motif of dreams shows itself. The fact that Daisy has a beautiful daughter is probably the only aspect of her current marriage that she finds fruitful.
For Gatsby, the irony is sharp. The child is a reminder of the past, and potentially future, failure of his own dream.
To help improve the meaning of these lyrics, visit "The Great Gatsby (Chapter VII)" by F. Scott Fitzgerald and leave a comment on the lyrics box