Birth Order has no Meaningful Effect on Personality or IQ

For those who believe that birth order influences traits like personality and intelligence, a massive new study offers some good news: Yes, the study found, first-borns do have higher IQs and consistently different personality traits than those born later in the family chronology. However, researchers say, the differences between first-borns and 'later-borns' are so small that they have no practical relevance to people's lives.

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