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the claim

Firstborn children are more intelligent than later-born children.

the verdict
INSUFFICIENT LEANING
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Firstborn children are more intelligent than later-born children?

Unclear. Several sources indicate firstborns tend to score higher on ability and achievement measures and that intelligence test scores decrease with increasing birth order, but these are partial, often background or hedged statements rather than a direct test of the claim. No item provides a full, rigorous demonstration that firstborns are more intelligent than later-borns.

Verdict: PARTIAL LEAN · 6 sources for, 0 against · Last checked

Evidence for · 6
The Correlation Between Ordinal Position - First Born - and Academic Achievement of Elementary School Children.
1980
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Adrienne, W. (1980). The Correlation Between Ordinal Position - First Born - and Academic Achievement of Elementary School Children.. eric.ed.gov. https://eric.ed.gov/?id=ED223324

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More for · 5
Psychology
1981
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A, R. S. (1981). Psychology. archive.org. https://archive.org/details/psychology00rath

The Intellectual Achievement of Only Children
1988
Get citation
Polit, D. F. & Falbo, T. (1988). The Intellectual Achievement of Only Children. doi.org. https://doi.org/10.1017/s0021932000006611

Psychology
2011
Get citation
Schacter, D. L., Gilbert, D. T., & Wegner, D. M. (2011). Psychology. books.google.com. http://books.google.com/books?id=emAyzTNy1cUC&dq=Firstborn+children+are+more+intelligent+than+later-born+children.&hl=&as_pt=BOOKS&source=gbs_api

Associations of Birth Order with Early Adolescent Growth, Pubertal Onset, Blood Pressure and Size: Evidence from Hong Kong’s “Children of 1997” Birth Cohort
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Associations of Birth Order with Early Adolescent Growth, Pubertal Onset, Blood Pressure and Size: Evidence from Hong Kong’s “Children of 1997” Birth Cohort. (n.d.). doi.org. https://doi.org/10.1371/journal.pone.0153787

The secular trend of intelligence test scores: The Danish experience for young men born between 1940 and 2000
Get citation
The secular trend of intelligence test scores: The Danish experience for young men born between 1940 and 2000. (n.d.). doi.org. https://doi.org/10.1371/journal.pone.0261117

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