Here are the original lyrics, from Indiana University Sheet Music Collections:

WILL THE ANGELS LET ME PLAY?
Words, W L Werden; Music, Fred E Gladdish; 1905.

1. In a yard where children were playing games one day,
A little tot so lonely was watching wistfully.
It seemed so hard she could not play as other children do.
They said that she would spoil the games, and was a baby, too.
Her tender heart is breaking, for they won't let her play,
And as she goes to Mama, she murmurs plaintively:

CHORUS: "Mama, when I go to heaven, will the angels let me play?
Just because I am so little, will they say I'm in the way?
Here the children never want me. I'm a bother, they all say.
When I go to heaven, mama, will the angels let me play?"

2. "I'm so tired, dear Mama," the little darling said,
"Please rock me just a little, and then put me to bed.
I wish that papa would come home before I go to sleep
Just tell him how I waited for his kiss upon my cheek."
One night when all was silent, the angels came that way,
And took the little darling whose sweet lips seemed to say: CHORUS

* * *
[However, it looks like the folk process got hold of it before George Morgan recorded it. Here's an excerpt of his version, which he recites over background music:]

...kids wouldn't let him play.
And as he hobbled to his mom on his crutches, with his eyes full of tears,
She heard her little crippled boy say:
"Gosh, Mommy, I'm so awfully tired." And then he bowed his little head.
"Won't you rock me just a little bit, Mom, before I have to go to bed?
And gee, how I wish that Daddy would come home...."

[Recorded by George Morgan on "Candy Kisses," Bear Family BCD 15851, 1996. Also by Elton Britt on "Beyond the Sunset," ABC 322, 1960.]