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the claim

Heartburn during pregnancy is caused by the baby growing hair.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 3 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 heartburn during pregnancy is caused by the baby growing hair?

Partly. Reference sources attribute pregnancy heartburn mainly to hormonal relaxation of the lower esophageal sphincter and mechanical pressure, not to fetal hair growth. One 2006 study of 64 women and a Skeptics.SE answer report a correlation between heartburn severity and newborn hair volume, but this is an association with a proposed shared-hormone mechanism, not evidence that hair growth causes the heartburn.

Verdict: CONTESTED PARTIAL · 2 sources for, 3 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Pregnancy Folklore Revisited: The Case of Heartburn and Hair
2006
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Costigan, K. A., Sipsma, H. L., & DiPietro, J. A. (2006). Pregnancy Folklore Revisited: The Case of Heartburn and Hair. doi.org. https://doi.org/10.1111/j.1523-536x.2006.00128.x

Evidence against · 3
Heartburn in pregnancy
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Heartburn in pregnancy. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Heartburn_in_pregnancy

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More for · 1
Do babies born with lots of hair cause heartburn during pregnancy?
2014
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Do babies born with lots of hair cause heartburn during pregnancy?. (2014). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/22087/do-babies-born-with-lots-of-hair-cause-heartburn-during-pregnancy

More against · 2
Heartburn
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Heartburn. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Heartburn

Review article: the management of heartburn in pregnancy
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Review article: the management of heartburn in pregnancy. (n.d.). cir.nii.ac.jp. https://doi.org/10.1111/j.1365-2036.2005.02654.x

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