Daijiworld Media Network - Madrid

Madrid, Mar 5: The long-standing cliché of “baby brain” — often used to suggest forgetfulness and reduced capability during pregnancy — is being re-examined after a landmark study revealed that pregnancy brings significant structural changes to the brain, potentially enhancing a mother’s ability to care for her newborn.

The research, conducted under the Be Mother project and published in Nature Communications, is the largest of its kind to date. Scientists tracked 127 pregnant women, scanning their brains before, during and after pregnancy, and compared the results with 52 women who had never been pregnant.

The findings indicate that grey matter — the nerve-rich tissue responsible for processing information, emotions and empathy — decreases by an average of nearly 5% during pregnancy. However, researchers stress that this reduction is not a cause for alarm.

Prof Susana Carmona, director of the NeuroMaternal laboratory at the Gregorio Marañón Health Research Institute in Madrid, described the changes as potentially beneficial.

“We find in biology, as in life, sometimes less is more,” she said, explaining that the brain may be “rewiring” itself to prepare for motherhood. Using the metaphor of pruning a tree, she noted that trimming certain branches allows for more efficient growth.

The study observed that the greater the structural brain changes, the more strongly women reported bonding with their babies. Notably, one of the most affected areas was the brain’s default mode network, linked to self-perception, empathy and altruism.

Interestingly, while grey matter partially recovered within six months after childbirth, it did not completely return to pre-pregnancy levels. In contrast, women who were not pregnant showed relatively stable grey matter levels over the same period.

Tania Esparza, one of the participants and now a new mother, welcomed the findings. “Rather than becoming dumber, we are becoming more specialised for the job,” she remarked, expressing frustration at pregnant women being “infantilised.”

Researchers clarified that the study was not specifically designed to examine memory lapses commonly associated with pregnancy. However, it provides fresh insight into the biological transformations occurring during this pivotal stage of life.

Pregnancy is known to bring changes to several organs — including enlargement of the heart and increased lung capacity — and scientists say it is logical that the brain undergoes adaptation as well.

To distinguish between biological and social aspects of parenting, the team also included partners of pregnant women in their control group. “You can be many types of parents, and you don’t need to be pregnant to be a good one,” Carmona emphasised.

Experts say the findings open the door for further research into maternal brain health, underscoring that pregnancy may not diminish cognitive ability but instead fine-tune the brain for the demands of nurturing a newborn.