Curt Sandman and his team measured the depression levels of 221 healthy women during their pregnancy and for twelve months after their children were born. The babies were subsequently categorised into four groups. There were two "concordant" groups, for whom the environment was the same prenatally and post-natally, as in their mother was either depression-free in both phases or she had depression in both phases. And there were two "discrepant" groups, for whom the prenatal and postnatal environments were different, as in their mother had depression in one phase but not the other.


Here's the take-home finding: babies in the concordant groups exhibited superior scores on mental development at 3 and 6 months of age, and superior psychomotor development at 6 months, compared with the discrepant babies. Crucially, this was the case for both concordant groups. In other words, for babies whose mothers were depressed postnatally, it was those whose mothers were also depressed during pregnancy who fared better. This counterintuitive finding appears to contradict the received wisdom that adversity during pregnancy is only ever associated with adverse outcomes.


Zeroing in on the timings, it was specifically the consistency or not between a mother's depression state at 25 weeks' gestation and her depression state postnatally that had associations with the babies' developmental outcomes. This makes sense because past research has found mothers' depression at 25 weeks' gestation (as opposed to at other times) to be most strongly related with their emotional state postnatally. The researchers said it's as if the unborn child is "most sensitive to maternal signals of adversity when those signals are the most predictive of future outcomes."



Sandman, C., Davis, E., and Glynn, L. (2012). Prescient Human Fetuses Thrive. Psychological Science, 23 (1), 93-100 DOI:


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From BPS Research Digest