[RushIsMyTeddyBear]

“The study only mentioned rich vs. poor. What about family situation? They did not mention the big taboo, 2 parents vs. 1 parent. I would bet that that is the biggie, not wealth.”
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Good point. And I also wonder how much diet plays a factor in this as well.

[aruanan]

Good point. And I also wonder how much diet plays a factor in this as well.

Probably not as much as you'd think. We're now living in a day where the "poor" are frequently obese. With the wide range of foods supplemented with vitamins and minerals and with a much wider range of foods available, even in fast food restaurants, there is far less chance now than in previous decades and centuries for someone to develop a micronutrient deficiency disease that would have an impact on mental development.

[panthermom]

I think early stimulation has the most to do with it. Plopping a baby in a bouncy seat or a swing and putting an Elmo video on is not stimulating a baby.