Two small Christmas carols of Georgia African-Americans were collected by Emma M. Backus and published in the Jour. American Folk-Lore, 1899, vol. 12 no. 47, p. 272. They seem to be cradle carols, or carols to be sung by children. Ms Backus gives no details of collection, and apologises for not being able to provide a melody.

Carol 1.

De leetle cradle rocks to-night in glory,
In glory, in glory,
De leetle cradle rocks to-night in glory,
De Christ-chile born.
Peace on earth,
Mary rock de cradle,
Peace on earth,
Mary rock de cradle,
Peace on earth,
Mary rock de cradle,
De Christ-chile born in glory,
In glory, in glory,
De Christ-chile born in glory.

Carol 2.

De Christ-chile am passin',
Sing softly,
De Christ-chile am passin',
Sing low.
Don' yo' hear he foot on de treetop,
Sof' like de south win' blow?
Glory hallelu!
Glory, glory, glory,
Glory hallelu!

These two carols are combined and revised, with an added first verse, but printed without notes and without tune in Hymns and Carols of Christmas.

Lyr. Add: THE LITTLE CRADLE ROCKS TONIGHT
(Spiritual from Georgia)

If anybody asks you who I am,
who I am, who I am
If anybody asks you who I am,
Tell him I'm a child of God.
Glory, the Christ child born in glory.
2.
The little cradle rocks tonight in glory,
Rocks in glory, rocks in glory,
The little cradle rocks tonight in glory,
The Christ child born in glory.
3.
Peade on earth, Mary rock the cradle,
Pock the cradle, rock the cradle,
Peace on earth, Mary rock the cradle,
The Christ child born of glory.
4.
The Christ child passing, singing softly,
Singing softly, singing softly,
The Christ child passing, singing softly,
The Christ child born in glory.

The first stanza was collected by R. Emmett Kennedy and published in "Mellows," a collection of spirituals, in 1925 (a very hard to get volume, not seen).

Lyr. Add: CHILD OF GOD
(The Little Cradle Rocks Tonight in Glory)

1.
If anybody ask you who I am,
Who I am, who I am,
If anybody ask you who I am,
Tell him I'm a child of God.
2.
The little cradle rocks tonight in glory,
In glory, in glory,
The little cradle rocks tonight in glory,
The Christ child born in glory.
3.
Peace on earth, Mary rock the cradle,
Mary rock the cradle, Mary rock the cradle,
Peace on earth, Mary rock the cradle,
The Christ child born in glory.
4.
The Christ child passing, singing softly,
Singing softly, singing softly,
The Christ child passing, singing softly,
The Christ child born in glory.
5.
Don't you hear the foot on the tree top,
Foot on the tree top, foot on the tree top,
Don't you hear the foot on the tree top,
Soft like the south wind blow?

From folkinfo.org, copied from Elizabeth Poston, "The Second Penguin Book of Christmas Carols."
The folkinfo site has a partial score; no notes as to source (by Poston?). Except for the first verse, which really doesn't fit the theme, the revisions do not change the original carols collected by Backus, except to remove the "Glory hallelu!" at the end of the second carol when the two are united.

http://www.folkinfo.org/songs/displaysong.php?songid=348
Child of God