The Oldest Child Is Smarter and Here's Why

First Born Children Are Smarter Than Their Siblings

New study says the oldest child is smarter than their siblings.

First-born children are smarter than younger siblings

Are You Smarter Than Average?

Why Older Siblings are Smarter???

First-Born Children Are Smarter Than Their Siblings A Study Says

Study: first born children are smarter

First-born children may be smarter than their siblings, study finds

First-Born Children Are Smarter Than Their Siblings A Study Says | Woman's Day

When That One Student Asks The Forbidden Question.

I’m smarter!😜💗💜 #sisters #shorts

Are you smarter than a YouTuber? 🧠

Firstborns are smarter

Elder Siblings Smarter?

3 Facts About The Oldest Child! 😲👨‍👦

Ep. 9 Does sibling order influence intelligence? Are order siblings smarter, are younger ones mor...

Is the oldest child smarter?

I’m Smarter Than All Of My Family Combined 😱