When you play Am7 during the verses, omit the 5th.
For the G7 chord on "once there was a way", omit the 5th.
Verse
Once there was a way to get back homeward
Once there was a way to get back home
Sleep pretty darling do not cry
And I will sing a lullaby
Chorus
Golden slumbers fill your eyes
Smiles awake you when you rise
Sleep pretty darling do not cry
And I will sing a lullaby
Verse
Once there was a way to get back homeward
Once there was a way to get back home
Sleep pretty darling do not cry
And I will sing a lullaby
Ending there sounds fine, but the real song goes straight into "Carry That Weight".