Where are you going, my little one, little one?
Where are you going, my baby, my own?
Turn around & you're two, turn around & you're four.
Turn around & you're a young man going out of the door.
Turn around, turn around / (repeat 4'th line)

Where are you going, my little one, little one?
Scraped knees and skateboards, where have you gone?
Turn around & you're tiny, turn around & you're grown.
Turn around & you're a husband with babes of your own.

Just a suggestion. Find out what he has outgrown that really identified him as a kid. Otherwise, the words are pretty inclusive.