What is the book hush little baby dont say a word about?

Answer 1

I think it's a song/lullaby (many versions), rather than a book, of which the next lines are:

Momma's gonna buy you a mocking-bird

An' if that mocking bird don't sing

Momma's gonna but you a golden ring

- and so on through a succession of such lines, each time with compensation for lack, until finally, even with nothing 'You're still the sweetest little baby in town'.