Pregnancy and the postpartum period are marked by increased neuroplasticity in the maternal brain. This study used MRI to examine changes in gray matter volume (GMV) in 20 healthy postpartum women over 12 weeks, comparing them to 20 nulliparous women. The first 6 weeks postpartum showed significant GMV changes, with the amygdala, hippocampus, prefrontal cortex, and insula showing reduced volume, approaching nulliparous levels by weeks 3–6. By week 12, GMV in the dorsomedial prefrontal cortex and subgenual prefrontal cortex had not fully recovered. The study found that GMV changes in the amygdala, temporal pole, olfactory gyrus, anterior cingulate, thalamus, and cerebellum predicted less hostile behavior toward the child at 6–12 weeks postpartum. The maternal brain does not fully revert to pre-pregnancy levels, with neuroplasticity influencing key parenting-related brain regions. The study also found that GMV changes from 9 to 12 weeks predicted maternal attachment scores, including the absence of hostility. Hormonal fluctuations, particularly progesterone, were linked to GMV changes in the left inferior frontal gyrus and middle orbital gyrus. The study highlights the time-dependent restructuring of the maternal brain, with significant changes occurring in the subacute postpartum period. These changes may be particularly important for parenting behavior, as they affect socio-emotional processing and attachment. The findings suggest that postpartum neuroplasticity is crucial for maternal behavior and that the maternal brain continues to develop and specialize during the postpartum period. The study also notes that while the nulliparous control group was not measured as frequently as the postpartum group, the comparisons were considered robust. The study underscores the importance of understanding the dynamic changes in the maternal brain and their implications for maternal behavior and attachment.Pregnancy and the postpartum period are marked by increased neuroplasticity in the maternal brain. This study used MRI to examine changes in gray matter volume (GMV) in 20 healthy postpartum women over 12 weeks, comparing them to 20 nulliparous women. The first 6 weeks postpartum showed significant GMV changes, with the amygdala, hippocampus, prefrontal cortex, and insula showing reduced volume, approaching nulliparous levels by weeks 3–6. By week 12, GMV in the dorsomedial prefrontal cortex and subgenual prefrontal cortex had not fully recovered. The study found that GMV changes in the amygdala, temporal pole, olfactory gyrus, anterior cingulate, thalamus, and cerebellum predicted less hostile behavior toward the child at 6–12 weeks postpartum. The maternal brain does not fully revert to pre-pregnancy levels, with neuroplasticity influencing key parenting-related brain regions. The study also found that GMV changes from 9 to 12 weeks predicted maternal attachment scores, including the absence of hostility. Hormonal fluctuations, particularly progesterone, were linked to GMV changes in the left inferior frontal gyrus and middle orbital gyrus. The study highlights the time-dependent restructuring of the maternal brain, with significant changes occurring in the subacute postpartum period. These changes may be particularly important for parenting behavior, as they affect socio-emotional processing and attachment. The findings suggest that postpartum neuroplasticity is crucial for maternal behavior and that the maternal brain continues to develop and specialize during the postpartum period. The study also notes that while the nulliparous control group was not measured as frequently as the postpartum group, the comparisons were considered robust. The study underscores the importance of understanding the dynamic changes in the maternal brain and their implications for maternal behavior and attachment.