I was thinking why there is such a high risk for early learners to become loosers.
(I am early learner and looser too, so I have right to talk about it

)
Testing is a part of traditional teaching.
Now I know that testing creates stress for child, and that children often answer wrong because they can not say precisely what they feel and think.
But there is something more which I understood just now.
If the child answers wrong, there is a moment of disappointment. Even if the tester does not say anything bad, for short moment child thinks that he is not good.
As more teaching, as more such moments when child thinks that he is not good enough for his parents. These moments accumulate in lower self-confidence.
In result, such early-educated kid has lower self- confidence than un-educated child of the same age. By default.
When I ask to my doughter questions like "how many fingers there are", she always replies "two". Probably, she knows more but can not say. I will not ask such questions any more and never.
I will let my child learn in the same way she learns to play and to have fun; nobody is testing her progress in these disciplines
upd.
and thank you for this discussion because I discovered such an important thing for me