When was this understanding updated?

The evidence had largely shifted by around 2017. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

Is "Pregnancy causes 'baby brain' and makes women forgetful or less intelligent" true?

'Baby brain' gets treated as an established fact about pregnancy: expect a memory dip and some mental fog for nine months, no questions asked. It's repeated so casually, by so many people, that nobody thinks to check it anymore. Researchers who actually went looking for that cognitive decline haven't consistently found it. Hormonal shifts during pregnancy are real, but a lot of the reputation looks like cultural stereotype doing the heavy lifting rather than genuine impairment.

What you were taught

Pregnancy causes "baby brain" and makes women forgetful or less intelligent

What we know now

Research has not consistently found meaningful cognitive decline during pregnancy. Some studies suggest hormonal and organizational changes instead, and much of the "baby brain" reputation appears to be cultural stereotype rather than established neuroscience.

Updated understanding emerged around 2017

Source Comment

Psychology

Common questions

Was "Pregnancy causes 'baby brain' and makes women forgetful or less intelligent" taught in school?: Yes — and not as a joke question on a quiz. This psychology claim showed up in textbooks, worksheets, and classroom posters through the 2010s, which is why so many people still remember it as settled fact long after the science moved on.
Is "Pregnancy causes 'baby brain' and makes women forgetful or less intelligent" true?: No. Research has not consistently found meaningful cognitive decline during pregnancy. Some studies suggest hormonal and organizational changes instead, and much of the "baby brain" reputation appears to be cultural stereotype rather than established neuroscience. If you want the primary citation, start with Nature Reviews Neuroscience - Pregnancy and the Brain.
When was this understanding updated?: The evidence had largely shifted by around 2017. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

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