Hi - I'm wondering if anyone can offer insight into the origins of (or is familiar with other songs containing) the passage:

Go rock the cradle, go rock the cradle,
Go rock the cradle alone
How many men've rocked another man's babe
When he thought he was rocking his own?

I heard it sung in a song bearing lyric bits of In the Pines and Short Life of Trouble, to the tune of In the Pines, but can find nothing on this stanza.

Many thanks.