In the '50s, his parents would have been arrested for child neglect for letting him do those videos.

"Child sensations" are difficult to assess, but the '80s had some decent ones "Tiffany", "Debbie Gibson" and Asia's "Tiffany", Alyssa Milano.

I lived for a whole year as a kid in Asia, and Alyssa was a big singing sensation: YouTube - Alyssa Milano - Look In My Heart Music Video.