Don't let children to do it. Protect our children. It is very exhausting for them. Some of them get very tired, fainted, some cried, some wanted their abilities to be "taken away"..... they don't want it, don't need it. It is very troublesome for them.
It is unstable, does not prove anything, does not help in the progress of any practice........
If you know of any children with the ability:
DON'T EVER EVER ASK THEM TO DO DEMONSTRATION !
Many of them cried !!