Second Pregnancy Reshapes Brain Differently Than First
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- Amsterdam UMC researchers followed 110 women with repeated brain scans — some first-time pregnant, some pregnant with their second child, and some childless — and published the findings in Nature Communications
- A first pregnancy produced the largest changes in the Default Mode Network, the system tied to self-reflection and social thinking
- A second pregnancy generated smaller Default Mode Network changes but larger shifts in networks that direct attention and process sensory cues, patterns researcher Milou Straathof said may help with caring for multiple children
- The study found the link between pregnancy-related brain changes and mother-child bonding was stronger after a first pregnancy than after a second
- Researchers identified the first evidence tying structural cortical changes during pregnancy to peripartum depression, with the timing of that association differing sharply by pregnancy history — appearing most strongly after childbirth for first-time mothers but during pregnancy itself for women expecting a second child
- Elseline Hoekzema, head of Amsterdam UMC's Pregnancy Brain Lab, led the work, building on her earlier study that first demonstrated pregnancy changes brain structure
Why it matters: This is the first longitudinal evidence that a second pregnancy produces a distinct brain-change pattern from a first, and the first to link cortical changes during pregnancy to peripartum depression. The timing divergence — depression associations surfacing postpartum for first-time mothers but during pregnancy for second-time mothers — gives clinicians a concrete new window for identifying at-risk women earlier.
