An old music-hall song went...

A mother was washing her baby one night
The youngest of ten and a delicate might
The mother turned 'round for the soap off the rack
She was only a moment - but when she turned back
Her baby had gone and in anguish she cried
"Oh where has my baby gone?"
The angels replied

Chorus
"Your baby has gone down the plug-hole
Your baby has gone down the plug
The poor little thing was so skinny and thin
He should have been washed in a jug - In a jug
Your baby is perfectly happy
He won't need a bath any more
For he's mucking (messing) about with the angels above
Not lost! But gone before."

Believe it or not it appeared on 'Disraeli Gears' by 'Cream' (Eric Clapton, Jack Bruce & Ginger Baker) in the late 60's