Birth order refers to the order a child is born, for example first born, second born etc. Birth order is often believed to have a profound and lasting effect on psychological development. This assertion has been repeatedly challenged the largest multi-study research suggests zero or near-zero effects. Birth-order theory has the characteristics of a zombie theory, as despite disconfirmation, it continues to have a strong presence in pop psychology and popular culture.
Alfred Adler (1870–1937), an Austrian psychiatrist, and a contemporary of Sigmund Freud and Carl Jung, was one of the first theorists to suggest that birth order influences personality. He argued that birth order can leave an indelible impression on an individual's style of life, which is one's habitual way of dealing with the tasks of friendship, love, and work. According to Adler, firstborns are "dethroned" when a second child comes along, and this may have a lasting influence on them. Younger and only children may be pampered and spoiled, which was suggested to affect their later personalities.
Since Adler's time, the influence of birth order on the development of personality has become a controversial issue in psychology. Among the general public, it is widely believed that personality is strongly influenced by birth order, but many psychologists dispute this. One modern theory of personality states that the Big Five personality traits of Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism represent most of the important elements of personality that can be measured. Contemporary empirical research shows that birth order does not influence the Big Five personality traits.
In his book Born to Rebel, Frank Sulloway suggested that birth order had powerful effects on the Big Five personality traits. He argued that firstborns were much more conscientious and socially dominant, less agreeable, and less open to new ideas compared to laterborns. However, critics such as Fred Townsend, Toni Falbo, and Judith Rich Harris, argue against Sulloway's theories. A full issue of Politics and the Life Sciences, dated September, 2000 but not published until 2004 due to legal threats from Sulloway, contains carefully and rigorously researched criticisms of Sulloway's theories and data. Subsequent large independent multi-cohort studies have revealed approximately zero-effect of birth order on personality.
In their book Sibling Relationships: Their Nature and Significance across the Lifespan, Michael E. Lamb and Brian Sutton-Smith argue that as individuals continually adjust to competing demands of socialization agents and biological tendencies, any effects of birth order may be eliminated, reinforced, or altered by later experiences.
Claims about birth order effects on personality have received much attention in scientific research, with the conclusion from the largest, best-designed research being that effects are zero  or near zero. Such research is a challenge because of the difficulty of controlling all the variables that are statistically related to birth order. Family size, and a number of social and demographic variables are associated with birth order and serve as potential confounds. For example, large families are generally lower in socioeconomic status than small families. Hence third-born children are not only third in birth order, but they are also more likely to come from larger, poorer families than firstborn children. If third-born children have a particular trait, it may be due to birth order, or it may be due to family size, or to any number of other variables. Consequently, there are a large number of published studies on birth order that are confounded.
Literature reviews that have examined many studies and attempted to control for confounding variables tend to find minimal effects for birth order. Ernst and Angst reviewed all of the research published between 1946 and 1980. They also did their own study on a representative sample of 6,315 young men from Switzerland. They found no substantial effects of birth order and concluded that birth order research was a "waste of time." More recent research analyzed data from a national sample of 9,664 subjects on the Big Five personality traits of extraversion, neuroticism, agreeableness, conscientiousness, and openness to experience. Contrary to Sulloway's predictions, they found no significant correlation between birth order and self-reported personality. There was, however, some tendency for people to perceive birth order effects when they were aware of the birth order of an individual.
Smaller studies have partially supported Sulloway's claims. Paulhus and colleagues reported that first borns scored higher on conservatism, conscientiousness and achievement orientation, and later borns higher on rebelliousness, openness, and agreeableness. The authors argued that the effect emerges most clearly from studies within families. Results are weak at best, when individuals from different families are compared. The reason is that genetic effects are stronger than birth order effects. Recent studies also support the claim that only children are not markedly different from their peers with siblings. Scientists have found that they share many characteristics with firstborn children including being conscientious as well as parent-oriented.
In her review of the research, Judith Rich Harris suggests that birth order effects may exist within the context of the family of origin, but that they are not enduring aspects of personality. When people are with their parents and siblings, firstborns behave differently from laterborns, even during adulthood. However, most people don't spend their adult lives in their childhood home. Harris provides evidence that the patterns of behavior acquired in the childhood home don't affect the way people behave outside the home, even during childhood. Harris concludes that birth order effects keep turning up because people keep looking for them, and keep analyzing and reanalyzing their data until they find them.
Well-publicised observational studies find that first borns have slightly higher IQ than later borns. Such data are, however confounded with family size, which is in turn correlated with IQ confounds, such as social status. Some research has set out to explain the relationship, assuming it is real, other studies have tested to what degree the apparent effect is an artefact.
Robert Zajonc argued for a "confluence" model in which the lack of siblings experienced by first borns exposes them to the more intellectual adult family environment. This predicts similar increases in IQ for siblings who next-oldest sibling is at least five years senior. These children are considered to be "functional firstborns". The theory further predicts that firstborns will be more intelligent than only children, because the latter will not benefit from the "tutor effect" (i.e. teaching younger siblings). In a metanalysis, Polit and Falbo (1988) found that firstborns, only children, and children with one sibling all score higher on tests of verbal ability than laterborns and children with multiple siblings. This supports the conclusion that parents who have smaller families also have children with higher IQs.
Resource depletion theory (RDT) suggests that siblings divert resources from each other. The metanalysis, however, found no such effect. Additional claims have been made, for instance that siblings compete for parental affection and other resources via academic achievement balancing out confluence effects.
Importantly, the claim that firstborns have higher IQ scores that should be expected has itself been disputed. Data from the National Longitudinal Survey of Youth (NLSY) – a large randomly selected sample of US families includes children whose academic performance had been reviewed multiple times. These data show no relationship between birth order and intelligence.
==Sexua The fraternal birth order effect is the name given to the observation that the more older brothers a man has, the greater the probability is that he will have a homosexual orientation. The fraternal birth order effect is the strongest known predictor of sexual orientation, with each older brother increasing a man's odds of being gay by approximately 33%. Even so, the fraternal birth order effect only accounts for a maximum of one seventh of the prevalence of homosexuality in men. There seems to be no effect on sexual orientation in women, and no effect of the number of older sisters.
In Homosexuality, Birth Order, and Evolution: Toward an Equilibrium Reproductive Economics of Homosexuality, Edward M. Miller suggests that the birth order effect on homosexuality may be a by-product of an evolved mechanism that shifts personality away from heterosexuality in laterborn sons. This would have the consequence of reducing the probability of these sons engaging in unproductive competition with each other. Evolution may have favored biological mechanisms prompting human parents to exert affirmative pressure toward heterosexual behavior in earlier-born children: As more children in a family survive infancy and early childhood, the continued existence of the parents' gene line becomes more assured (cf. the pressure on newly-wed European aristocrats, especially young brides, to produce "an heir and a spare"), and the benefits of encouraging heterosexuality weigh less strongly against the risk of psychological damage that a strongly heteronormative environment poses to a child predisposed toward homosexuality.
More recently, this birth order effect on sexuality in males has been attributed to a very specific biological occurrence. As the mother gives birth to more sons, she is thought to develop an immunity to certain male-specific antigens. This immunity then leads to an effect in the brain that has to do with sexual preference. Yet this biological effect is seen only in right-handed males. If not right-handed, the number of older brothers has been found to have no prediction on the sexuality of a younger brother. This has led researchers to consider if the genes for sexuality and handedness are somehow related.
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