Men who are only children take greater financial risks than other men.Medical students are more likely to be firstborns or only children.Firstborns are more likely to become CEOs.Biology majors in college are more likely to be firstborn children.Kids born in the first position are less likely to smoke cigarettes than their siblings.Men who are born earlier in their family are more emotionally stable than younger siblings.Firstborn children have slightly higher IQs (only about two points) than children in other birth order positions.Findings include things like how birth order impacts your personality, which in turn impacts your career choice. Whether you believe birth order affects your personality or not, research supports more findings about firstborn and only children personalities than any other birth positions.