A study resolves the long-standing debate over which sibling is “the smartest.”

It turns out that your level of intelligence may just be influenced by your family’s social hierarchy.

Studies have repeatedly demonstrated that the older sibling is frequently the more intelligent.

This is a pattern that has been repeatedly seen rather than a hard-and-fast rule. One thing unites scientists: parental love is unconditional and extends to every child, regardless of status—from the youngest member of the family to the firstborn.

However, it’s the other elements that shape a child’s intellect and behavior, and these factors are where the differences lie.

Investigating why firstborns frequently excel academically yields some intriguing conclusions.

According to a Journal of Human Resources study, firstborns tend to perform better on IQ tests than their younger siblings.

In collaboration with academics from the Universities of Sydney and Edinburgh, this study followed 5,000 kids from birth until the age of 14. The study’s conclusions were very telling: firstborns not only have a cognitive advantage at birth, but this advantage also tends to strengthen with age and become more pronounced by the time they enter school.

It appears that the intellectual divide between the oldest and youngest siblings widens rather than stays at that level.

Researchers didn’t give up on their work.


It appears that with their first child, parents pull out all the stops.

There’s more mental and physical engagement, including more activities.

First-time parents are also more cautious, avoiding smoking or drinking to protect their newborn.

As families grow, however, the intensity of these early childhood regimens often wanes.

It’s not a matter of love diminishing but rather a sense of having been through it all before.

This leads to a more relaxed approach with the subsequent kids.

It’s worth noting, though, that this isn’t a universal truth—some parents maintain the same level of vigilance for all their children.

But birth order affects more than just IQ; it also defines personality.

The eldest children generally show greater ambition, responsibility, and leadership traits.

The youngest children are typically the charmers, the creatives, and occasionally the manipulators, whereas the middle children are the mediators and those who find common ground.

It confirms the results of the National Longitudinal Survey of Youth, which monitored the employment, income, and educational attainment of teenagers and young people.

The purpose of the study was to determine whether birth order and achievement in later life were correlated in any way. According to both research, the earliest children frequently turn out to be the most successful and intelligent, gaining leadership positions and higher incomes. However, this doesn’t mean younger siblings are destined for less; these are trends, not destinies.


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