Firstborns feel family pressure to excel and science backs it up: birth order is an important driver of career choices. What is less well understood is the role of birth order and intelligence – at least in my family.
Birth order might sound a bit farfetched for a science or careers topic, like astrology, biorhythms or a fad pizza diet, but it’s not. A Norwegian Armed Forces Medical Services study published in Science shows that firstborns of either sex are, on average, 2.3 IQ points smarter than their younger sibs.
Those several IQ points make an enormous difference when it comes to getting into college and ultimately advancing in life, contends Dr. Frank Sulloway, author of Born to Rebel: Birth Order, Family Dynamics and Creative Lives. Sulloway, who commented on the study in the New York Times and in this month’s Science (fees, registration required), says, “There’s some evidence to suggest that first and later-borns go into different kinds of careers and have associated different motivations.”

