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First-borns Have Higher IQs Than Their Younger Siblings
The study also suggests that its how the kids are raised, not their birth order, that counts, according to the Norwegian researchers who authored the report, published in the journal Science.
The investigators found that children raised as the eldest showed slightly higher IQs than their younger siblings.
Even if a child had lost an older sibling and was raised as the eldest, their IQ was higher by an average of 2.3 points than their younger siblings.
Petter Kristensen, from the University of Oslo, and Tor Bjerkedal from the Norwegian Armed Forces Medical Services in Oslo examined data gathered from 241,310 Norwegian kids, all aged 18 or 19 years old at the time of intelligence testing.
They found that the mean IQ of first-born kids was just over 103, second-borns just over 100, and third-borns about 99. But if a child's elder sibling had died, leaving him or her to be raised as first-born, their IQ shot up to match the peak scores of 103. Similarly if both of two elder siblings had expired, these third-born children had IQs matching that of first-borns.
In a separate analysis, the researchers have suggested that it isn't just that big families have less smart kids, and small families have brilliant ones. The researchers showed that the tendency holds true for different pairs of siblings in their study group; even within single families, older siblings are on average smarter.
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