No one, not even Kristensen, thinks the debate is over For one thing, there s still that argument about what s causing birth-order effects. It s possible, says UC Berkeley researcher Frank Sulloway, that trying .to treat kids in an evenhanded way in fact results in inequity. Well-meaning parents may end up shortchanging middleborns because there s one thing they can t equalize: at no point in the middle child s life does he get to be the only kid in the house. Alternatively, says Sulloway; there s the theory he has his money on, the family-niche hypothesis Older kids, whether out of desire or necessity axe often called on to be assistant parents, he notes. Getting that early- taste of responsibility may prime them for achievement later on. If they think Oh, I m supposed to be more intelligent so I d better do my homework, it doesn t matter if they actually are more-intelligent, says Sulloway, It becomes a self-fulfilling prophecy. If the firstborns homework involves reading Science and Intelligence, there ll be no stopping them now.

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