We met when she was younger And I had no eyes for her. A few years went by and I saw her, Now I'm gonna try for her. (Look out, baby.) (chorus) She's not the little girl I once knew She's not the little girl I once She's not the little girl I once She's not the little girl I once knew. How could I ever have known that She'd be what she is today. An' look at how her boy friend calls her. I'll be movin' in one day. (split man) (chorus)
https://primoaccordo.net/beach-boys/little-girl-i-once-knew.htm