When a woman carries her second child, her brain does not simply repeat the adaptations seen in her first pregnancy. It responds in patterns that both echo and diverge from the initial experience, according to detailed imaging work that followed mothers across multiple time points.
Researchers at Amsterdam University Medical Center tracked 110 women with repeated multimodal MRI scans taken before conception, in the early weeks after birth and later in the postpartum period. The cohort included 30 women in a second pregnancy, 40 experiencing their first, and 40 who had never been pregnant. Both first and second pregnancies were linked to reductions in grey matter volume. Yet the location and intensity of those changes differed in instructive ways.
Alterations in the default mode network and frontoparietal network proved less marked during a second pregnancy. These circuits support self-reflection and the processing of social information. By contrast, stronger effects emerged in the dorsal attention network and somatomotor regions, including the corticospinal tract. Such patterns suggest enhanced plasticity in networks oriented toward the external world when a mother is preparing to care for more than one child.
We have shown for the first time that the brain not only adapts during the first pregnancy, but also during the second. During a first and second pregnancy, the brain changes in similar and unique ways. Each pregnancy leaves a unique mark on the female brain.
The words belong to Elseline Hoekzema, head of the Pregnancy Brain Lab at Amsterdam UMC, whose team published the findings in Nature Communications on 19 February 2026. The work builds directly on the group’s earlier demonstration of pregnancy-related brain changes in first-time mothers, extending the picture to show that neural adaptability continues rather than plateauing after a single birth.
Milou Straathof, another researcher at the centre, underlined the potential practical meaning.
It seems that during a second pregnancy, the brain changes more significantly in networks involved in responding to sensory stimuli and directing your attention. These processes can be beneficial when caring for multiple children.
Neurostructural shifts observed across both pregnancies correlated with the quality of mother-infant attachment. Links to peripartum depression appeared at different moments: after childbirth among first-time mothers and already during pregnancy in those expecting their second child. Hoekzema sees diagnostic promise in the data.