A recent study by Damian and Roberts argued that there wasn't enough evidence to confirm that personality is affected by birth order. Their research paper states: "The debate over the effects of ...

The psychology professors’ research paper, which can be found online, stated that high school students who were only children or were twins, triplets or quadruplets were excluded from the study ...

Stewart, who wrote what is perhaps the definitive recent work (2012) on the theory and research on birth order. He bases his paper on 529 journal articles published over a 20-year period.

While this paper does not, on its own, disprove the so-called birth-order effect, it does signal the need for more research. Write to Tanya Basu at [email protected] ...

Research shows middle children engage in riskier behavior than their older siblings. It might be a tough place in the birth order, but being the in-between also has its benefits. A large study ...

These findings are not likely to be the last word in birth order research. Other studies have found no significant differences in personality traits among siblings of different birth orders.

"It was surprising the results are so clear,” co-paper author Julia Rohrer ... This study is not the be-all-end-all of birth order research, though, so it may take a lot more work (and more ...

A researcher named Alfred Adler developed birth order theory in the 20th century. The theory claims that the order in which a child is born shapes their development and personality. Adler also ...

Birth order theory suggests that first- and last-born children have a unique position in the family, while middle children do not. Research suggests that middle-born children may believe that they ...

Much of the early research has also been debunked over time. But not this "fraternal birth order effect." The fact that a person's likelihood of being gay increases with each older brother has ...

Stewart, who wrote what is perhaps the definitive recent work (2012) on the theory and research on birth order. He bases his paper on 529 journal articles published over a 20-year period.