"so hush little baby don't you cry"
is the last line of the chorus (and the song)
Summertime and the living is easy
The fish are Jumpin' and the cotton is high
Your Daddy's rich and your momma's good lookin'
So hush little baby don't you cry
One of these mornin's you'r go'na rise up singin'
Your Go'na spread your wings
And you'l take to the sky
But till that mornin' there's nobody go'na harm you
so hush little baby don't you cry