Birth order has long been linked to differences in cognition, with firstborn children often outperforming their later-born ...

Birth order differences in neurodevelopment emerge at 6 months, linked to reduced parental engagement for second-born children.

Birth-order stereotypes may be pervasive on social media, but proving them is a different story.

Birth order, a non-genetic factor, may influence early neurodevelopment. A nationwide Japanese birth cohort study based on sibling pairs suggests that differences in neurodevelopment emerge during the ...

First-born children earn measurably higher incomes than their younger siblings on average. This pattern holds across diverse cultures, socioeconomic backgrounds, and family sizes. Birth order itself ...

Ever since I became pregnant with my second child—a boy!—there’s been one single detail I’ve been stuck on: The age gap. My first-born will be six years older than my newborn, something that feels ...

Birth order doesn’t just determine when family photos are arranged. According to developmental psychologists, your position in the family constellation significantly influences personality development ...

Many people believe that birth order shapes our personalities and has impact on the careers we choose, and the ways we behave. However, it is difficult to conduct good research on birth order, and ...