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Here’s some news that confirms what our Dr Kat has suspected for some time – the oldest child in a family is likely to have a higher IQ than his or her siblings. A Norwegian team found that first born children, or those who had lost their elder siblings and therefore become the oldest, scored higher on intelligence than their pesky younger brothers and sisters. The team studied more than 250,000 men in Norway, and although the difference in IQ between siblings was small, it works out as being statistically significant.