Eldest, youngest or middle: Which child has a higher IQ as per science

Have you ever thought about why brothers and sisters can be so different in their smarts, even if they had the same upbringings? Studies indicate that birth order might be the key, with older siblings often displaying enhanced cognitive abilities.

Eldest, youngest or middle: Which child has a higher IQ as per science
Have you ever thought about why brothers and sisters can be so different in their smarts, even if they had the same upbringings? Studies indicate that birth order might be the key, with older siblings often displaying enhanced cognitive abilities.