from the little bit i have read of these childhood exploits, they do not pass the truth test on many levels. however, your argument doesnt hold water. childrens lives are not public.
as far as i am concerned, the first miracle jesus did after conception was:
Luke 1:41
And it came to pass, that, when Elisabeth heard the salutation of Mary, the babe leaped in her womb; and Elisabeth was filled with the Holy Ghost:
that a twelve year old was able to teach the jews a few things is no miracle, unless you count that they actually listened.