Summary: Previous research has shown that a first pregnancy produces significant, lasting changes to a woman’s brain. New findings from Amsterdam UMC reveal that a second pregnancy also reshapes the maternal brain, but in different and complementary ways. These adaptations appear to help mothers meet the distinct cognitive and sensory demands of caring for more than one child.
In a prospective study of 110 women—some expecting their first child, some their second, and others remaining childless—researchers tracked structural and functional brain changes across pregnancies using repeated multimodal MRI scans. The results show that while the first pregnancy primarily remodels networks involved in self-reflection and social cognition, the second pregnancy produces stronger changes in networks that support attention and responses to sensory cues. The study also links pregnancy-related cortical changes to mother–infant bonding and to peripartum depression, with timing and expression varying between first- and second-time mothers.
Key Facts
- Distinct network changes: First pregnancies most strongly affect the Default Mode Network, tied to self-reflection and social processing. Second pregnancies produce greater changes in attention and somatomotor networks that help direct focus and respond to sensory information.
- Adaptation for multitasking: The heightened alteration of attention and sensory networks in second-time mothers may reflect biological preparation for managing multiple children simultaneously—splitting attention, detecting cues, and coordinating actions.
- Peripartum depression: For the first time, researchers found a relationship between cortical changes during pregnancy and peripartum depression. In first-time mothers these brain–depression links were most evident after birth; in second-time mothers they appeared more prominently during pregnancy.
- Mother–child bonding: Structural brain changes were associated with measures of maternal bonding, with a stronger correlation observed for first pregnancies than for second pregnancies.
- Ongoing plasticity: The findings emphasize the female brain’s remarkable plasticity, showing it continues to adapt and reorganize across multiple pregnancies rather than returning to a previous baseline.
Source: Amsterdam UMC
Overview of the study
Researchers at Amsterdam UMC, building on earlier work that first identified pregnancy-related brain changes, examined how a second pregnancy affects brain structure and function. The follow-up study, published in Nature Communications, followed 110 women across the preconception period and pregnancy. Participants included women expecting their first child, women expecting their second, and a control group of nulliparous participants. Repeated brain imaging allowed the team to compare how each pregnancy changed grey matter volume, white matter tracts, and resting-state functional network organization.
Lead investigators report that some neural adaptations seen after a first pregnancy are present again during a second, though often less pronounced, suggesting an initial primary reorganization that is further refined with subsequent pregnancy. Importantly, the second pregnancy produced stronger changes in externally oriented networks—specifically the dorsal attention and somatomotor networks and related white matter pathways—highlighting enhanced plasticity in systems that govern sensory processing and attentional control.
Different brain networks and their likely roles
The Default Mode Network showed the largest structural and functional shifts during a first pregnancy, consistent with changes in self-related processing and social cognition as women transition into a maternal identity. During a second pregnancy, that network continued to change but to a lesser degree. At the same time, networks that manage attention and somatomotor responses exhibited stronger alterations, which may facilitate rapid sensory detection, coordinated movement, and the ability to divide attention—skills useful when caring for an older child and a newborn.
Relationship with bonding and maternal mental health
The team observed associations between brain changes and the strength of the mother–infant bond, more clearly during first pregnancies. They also found that structural cortical changes relate to peripartum depressive symptoms. For first-time mothers the association was most evident postpartum, whereas for second-time mothers it was more apparent during pregnancy. These patterns suggest that timing of neurobiological vulnerability to mood symptoms can vary with parity.
Understanding these relationships may improve clinicians’ ability to identify and support mothers at risk for mood disorders during pregnancy and after childbirth. The findings highlight the importance of monitoring both psychological and neural changes across pregnancy, and they underscore that maternal mental health must be considered within the broader context of neurobiological adaptation.
Key Questions Answered:
A: “Normal” shifts. The structural changes observed do not indicate damage; rather, they reflect adaptive refinements. Pregnancy appears to reconfigure brain networks to meet the evolving social and sensory demands of parenting.
A: The brain emphasizes different skills with each pregnancy. The first pregnancy emphasizes social and self-related processing as identity and bonding take shape; the second pregnancy shows greater adaptation in attention and sensory networks to help manage multiple caregiving demands.
A: This study provides the first evidence linking specific cortical changes to peripartum depression. While not yet a clinical predictive tool, these neural markers could inform future strategies for early identification and intervention.
Editorial Notes:
- This article was edited for clarity by a Neuroscience News editor.
- The full journal paper was reviewed to prepare this summary.
- Additional context was provided by editorial staff to help explain implications for maternal health.
About this research on pregnancy and neuroplasticity
Author: Jack Cairns
Source: Amsterdam UMC
Contact: Jack Cairns – Amsterdam UMC
Image: Image credited to Neuroscience News
Original Research: The effects of a second pregnancy on women’s brain structure and function by M. Straathof, S. Halmans, P. J. W. Pouwels, E. A. Crone & E. Hoekzema. Nature Communications. DOI: 10.1038/s41467-026-69370-8
Abstract
The effects of a second pregnancy on women’s brain structure and function
Previous work demonstrated that a first pregnancy alters women’s brain structure and resting-state activity. This prospective preconception cohort study of 110 women—comprising first-time mothers, second-time mothers, and nulliparous controls—used multimodal MRI to compare changes across pregnancies. Differential changes between second and first pregnancies were observed in grey matter volume, white matter tracts, and functional network organization.
Results indicate similar but often less pronounced structural and functional changes in the default mode and frontoparietal networks for second pregnancies, suggesting that these networks undergo primary adaptation during a first pregnancy and are further refined during a second. In contrast, second pregnancies showed stronger alterations in the dorsal attention and somatomotor networks, including relevant white matter tracts, reflecting enhanced plasticity in externally oriented systems. Neurostructural changes in both groups correlated with measures of mother–infant attachment and peripartum depression. Together, these findings demonstrate that a second pregnancy produces both convergent and distinct neural transformations in the maternal brain.