You can always follow stories of famous prodigy.

Bad case - Ted Kaczynski (Unabomber) Good case - Terrence Tao (Fields Medalist)

I especially suggest you check out Terrence Tao's because he writes a lot and a lot of people write about him. I would consider him a success story as he is super intelligent, smart, and clearly grew up fine. However, I remember he warned prospective parents to "not do it".

Link: http://en.wikipedia.org/wiki/Terence_Tao Quote: "At the age of two, during a family gathering, Tao attempted to teach a 5-year-old child mathematics and English."