when I was a small child, my Dad used to sing me to sleep on occasions, God rest his soul. the song I most requested was:

THE LITTLE BOY THAT SANTA CLAUS FORGOT.

At the time, I couldn't imagine anything more sad and it always made me cry:

Christmas comes but once a year for ev'ry girl and boy,
The laughter and the joy they find in each toy.
I'll tell you of a little boy who lives across the way;
This little feller's Christmas is just another day.

He's the little boy that Santa Claus forgot,
And goodness knows he didn't want a lot.
He sent a note to Santa for some soldiers and a drum;
It broke his little heart when he found Santa hadn't come.

In the street, he envies all those lucky boys,
Then wanders home to last year's broken toys.
I'm so sorry for that laddie;
He hasn't got a daddy,
The little boy that Santa Claus forgot.

These days I'd say it's Eric Bogles 'The Band Played Waltzing Matilda'