"Baby brain" is a cliche long-used to describe women becoming forgetful and feeling less capable during pregnancy.
But a recent study - the largest to date - indicates that pregnancy has a profound structural impact on brains and offers new clues into the neurological changes in mums‑to‑be.
It suggests that grey matter - the nerve-rich part of the brain involved in processing information, emotions and empathy - decreases by an average of nearly 5% during pregnancy.
But rather than being a cause for concern, these changes may be beneficial when it comes to caring for newborns, say scientists working on the project in Spain.
One of the dozens of women, now a new mum, who took part in the study told us she welcomed the findings and was "tired of pregnant women being infantilised".
"Rather than becoming dumber, we are becoming more specialised for the job," said Tania Esparza.
The BBC was given exclusive access to the Be Mother project and those who have been taking part in it.
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