A surprising new study — or unsurprising, depending on who you are — suggests that the middle child takes the cake when it comes to certain personality traits. There's no denying that birth order ...

A sibling-matched study design analyzing a cohort of more than 2 million singleton births was found to be inconclusive in ...

Catherine Carr told Newsweek birth order isn’t destiny, but environments—siblings, gaps and resources—can shape identity.

Birth order has long been linked to differences in cognition, with firstborn children often outperforming their later-born siblings. Parental engagement and interaction have been suggested as ...

In a nationwide cohort study in Taiwan, positive associations between maternal acetaminophen prescriptions during pregnancy and attention-deficit/hyperactivity ...

The researchers emphasize that these differences are a result of the unique environment for twins—such as sharing parental ...

Feel like your parents always favored your older sibling? They might have benefited from that more than you realize. A new study suggests all that extra attention makes first-born children smarter ...

A new study published in PLOS Mental Health has explored whether having a sibling born preterm (before 37 weeks of gestation) affects the behavior of children born at term. In a study by the ...

A new study published in PLOS Mental Health has explored whether having a sibling born preterm (before 37 weeks of gestation) affects the behaviour of children born at term. In a study by the ...

Feel like your parents always favored your older sibling? They might have benefited from that more than you realize. A new study suggest all that extra attention makes first-born children smarter than ...