Here is how the song goes:

Rock a bye Baby in the tree top
When the wind blows, the cradle will rock
When the bough breaks, the cradle will fall
Down will come baby, cradle and all.

Baby is drowsing, cozy and fair
Mother sits near in her rocking chair
Forward and back the cradle she swings
Though baby sleeps, she hears what she sings.

Rock a bye Baby, do not you fear
Never mind, Baby, Mother is near
Wee little fingers, eyes are shut tight
Now sound asleep til morning light.