blog posts Massive study: Birth order has no meaningful effect on personality or IQ Jul 16, 2015 1:15 pm by Diana YatesResearch Share on Facebook Tweet Email Images While first-borns do have higher IQs and consistently different personality traits than those born later, researchers say the differences between first-borns and 'later-borns' are so small that they have no practical relevance to people’s lives. Share on Facebook Tweet Email