The document discusses theories on how birth order affects personality traits and life outcomes. Alfred Adler first proposed that birth order influences personality. Later theorists like Frank Sulloway analyzed traits associated with each birth order, like first borns being leaders and last borns more creative. Research also suggests birth order affects intelligence, with first borns scoring higher on IQ tests, and careers, with first borns more suited to management. Genetics are believed to also influence personality in addition to birth order effects from early family experiences. The theories remain widely debated regarding impacts.