I've known her since she was 'a babe in arms'. [=a baby who is carried in the arms of an adult; an infant]
When I began my political career, I was a mere 'babe in the woods'.
Hey 'babe', how've you been?
(..) tell you that you was great back there? Those guards! They thought they was all ofthat. Then you showed up, and bam! They was trippin' over themselves like babes in the woods. That really made me feel good to see that. - Oh, that's great. Really. - Man, it's good to be free. (..)2001 Shrek