"Back in 1890, Thomas Edison gave us some of the world's first talking dolls. Today, the glassy-eyed cherubs that are still around stand about 2 feet tall; they have wooden limbs and a metal body; and they sound supercreepy.... Edison built and sold about 500 of them back in 1890. Now, new technology has made hearing them possible for the first time in decades."The dolls were a commercial failure in part because they were expensive, and in part because the primitive wax recording technology required speech at a very high volume --- too loud for kids to produce, in fact.
So, Edison used adult employees to fake childrens' voices.
The results were, um, not euphonious.
Sample ("Now I lay me down to sleep..."):