Scientists have known for years that a first pregnancy fundamentally changes the structure and function of the human brain. What they did not know until now is that a second pregnancy does something different, not a repetition, but a distinct rewiring of its own.
A new study published July 11, 2026, in Nature Communications by researchers at Amsterdam University Medical Center found that each pregnancy leaves a unique imprint on the maternal brain, with a second pregnancy triggering a different pattern of neurological changes than a first pregnancy does.
