There are probably children who can do it but I would be hardpressed to describe how they would be found. For every child that did it there are many whose voices were damaged by a voice teacher or parents who decided to go for the gold.
A good voice teacher will protect the musical athlete they have as a student and bring them along the normal path.
If you want to hear what the effect of an overstressed voice is listen to men Gospel singers. Most of them have badly trashed voices because the music minister and the lead Pastor pushed them way to hard at an inappropriate age.