New Research Shows How a Second Pregnancy Changes the Brain
Motherhood reshapes the brain more than once.
Posted March 14, 2026 | Reviewed by Kaja Perina
Many pregnant moms will talk about having “baby brain” as they notice, for better or worse, the shifts in the way their brains function.
For years, research has supported that the brain does, in fact, go through a major transformation during pregnancy . Specifically, scientists have known that a first pregnancy changes the brain. Those changes are believed to help mothers bond with and care for their babies. But researchers recently asked an important question: What happens to the brain when a mom undergoes pregnancy again?
A new study followed 110 women before pregnancy and after birth: 40 first-time mothers, 30 second-time mothers, and 40 women who did not become pregnant (control group). Using MRI brain scans and questionnaires, researchers tracked how the brain changed during pregnancy and again after childbirth, and its impacts on maternal behaviors and mental health.
Findings from this innovative study show for the first time that brain changes don’t stop with a first pregnancy; instead, a second pregnancy uniquely changes a woman’s brain.
First Pregnancy Changes
In first-time pregnant mothers, there were adaptive neural network changes in the brain involved in:
This supports the idea that becoming a mother for the first time involves a deep reorganization of how the brain represents the self and relationships. In other words, first-time motherhood may require a foundational rewiring of identity.
Second Pregnancy Changes
The changes during a first-time pregnancy contribute more strongly to the initiation of maternal behaviors; whereas, in a second pregnancy these changes play a smaller role because maternal behavior has already developed. As such, results of the study demonstrated overlapping areas affected within the brain that “further fine-tuned in a similar, but more subtle way during a second pregnancy.”
While some of the same brain regions changed, stronger alterations appeared in brain networks involved in:
These brain networks may help second-time mothers manage the increased demands of caring for more than one child. In other words, brain changes during a first pregnancy may help with becoming a mother , while brain changes that happen with subsequent pregnancies may help the brain adapt to parenting multiple children.
What About Mental Health?
It has been well-established that pregnancy and postpartum are periods of high risk for the onset of mental health disorders, which can have significant effects on maternal-infant bonding . Approximately 1 in 5 women are impacted by perinatal mood and anxiety disorders (PMADs). As such, the present study also explored the relationship between brain changes across first and second pregnancies and mental health.
Results of the study found pregnancy-induced brain changes played a role in the development of mental health disorders and maternal-infant bonding for both first- and second-time mothers. For first-time mothers, brain changes were more closely linked to postpartum mood symptoms. For second-time mothers, brain changes were associated with mental health status during pregnancy . This may be due to the significant identity shift following a first-time postpartum experience, whereas for the second-time pregnant mother she may have higher stress levels during pregnancy due to additional childcare responsibilities.
Importantly, results suggest that the emotional landscape of first and second pregnancies may unfold differently at the neural level and have subsequent significant relational impacts on the family.
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Straathof, M., Halmans, S., Pouwels, P.J.W. et al. The effects of a second pregnancy on women’s brain structure and function. Nat Commun 17, 1495 (2026). https://doi.org/10.1038/s41467-026-69370-8
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Rachel Diamond, Ph.D., LMFT, PMH-C, is a licensed marriage and family therapist and certified in perinatal mental health through Postpartum Support International. She maintains a private practice, Rachel Diamond, PLLC, in Chicago.
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This article is part of the Bringwise Psychology Journal — daily insights on human behavior, mental health, and personal growth.