2nd critique: image of the child looking at the stars

Hi,

Apparently, in the Critique of Practical Reason there is a passage where Kant uses the image of a child in an adult's arms looking at the stars; I think it has to do with Kant's use of the metaphor of enlightenment as the coming-of-age of mankind. Does anyone know the exact passage? Or if anyone can point me towards other passages in Kant where he uses similar images, that would be helpful, too!

Thanks