Youtube description:

Ten Stone Baby, a British Pathe newsreel from 1935.

Despite the newsreel's original title "Ten Stone Baby", the boy Leslie Downes is actually 3-years-old. Seen with his parents in a kind of pen, Leslie is sat in an armchair. Somebody then dangles a bar of chocolate into the pen and he immediately sets to work at fetching it.

We also see Leslie playing with bricks.

Taken from the British Pathe newsreel archive: http://www.britishpathe.com