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Prenatal and postnatal droughts interact in shaping cognitive development.
Fabienne Pradella1,2,3,4, Sabine Gabrysch5,6,7, Reyn van Ewijk8
1Johannes Gutenberg University Mainz, Chair of Statistics and Econometrics, Mainz, Germany. pradella@uni-mainz.de.
Communications Medicine
|April 20, 2026
Summary
Prenatal drought exposure can impact children's cognitive development. Early-life drought conditions, both before and after birth, interact to affect cognitive performance, especially in agricultural communities.
Area of Science:
- Developmental biology
- Cognitive science
- Environmental health
Background:
- Developmental plasticity describes adaptations to environmental cues, often prenatal.
- Matching prenatal and postnatal conditions can benefit offspring health.
- The interaction between prenatal and postnatal exposures and offspring health is not well understood.
Purpose of the Study:
- To investigate the interaction between prenatal and postnatal drought exposures on cognitive performance.
- To understand how early-life nutrition, influenced by drought, affects cognitive development.
Main Methods:
- Utilized cognitive scores (math and reading) of 11-16 year-olds in rural India (N=2,032,917) from 2007-2018.
- Combined cognitive data with precipitation data, using rainfall below the 20th percentile as a proxy for nutritional adversity.
- Employed a quasi-experimental design to analyze the impact of drought exposures.
Main Results:
- Early-life droughts were found to negatively affect cognitive function.
- Positive interaction terms indicated that prenatal drought exposure prepared children for postnatal drought challenges.
- Children exposed to drought prenatally showed better adaptation to postnatal drought conditions.
Conclusions:
- Findings support phenotypic plasticity theory, where prenatal conditions prime organisms for similar postnatal environments.
- Increasing climate unpredictability leads to frequent mismatches between prenatal and postnatal conditions.
- These mismatches pose challenges for planned adaptation and health outcomes.
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