Shared and Disorder-Specific Prenatal and Perinatal Risk Factors for Neurodevelopmental Disorders: A Nationwide Cohort Study

Why It Matters

Identifying which early‑life exposures uniquely drive specific neurodevelopmental outcomes sharpens screening, informs preventive health policies, and helps allocate resources to the most vulnerable children.

Key Takeaways

• Extreme prematurity raises ID risk over fivefold
• Male sex triples ASD and ADHD odds
• Maternal obesity increases risk for all NDDs, strongest for ADHD
• Congenital malformations strongly linked to severe ID
• Socioeconomic disadvantage inversely related to ADHD diagnosis rates

Pulse Analysis

The study leveraged France's comprehensive SNDS health‑claims database, linking over 6.8 million live births to detailed maternal and neonatal records. By employing Cox models that accounted for co‑occurring neurodevelopmental disorders, the researchers could isolate both shared and disorder‑specific prenatal and perinatal risk factors. This methodological rigor provides a clearer epidemiological picture than prior studies that examined each disorder in isolation, highlighting the value of large, population‑wide registries for uncovering subtle exposure‑outcome relationships.

Shared vulnerabilities emerged across autism spectrum disorder, attention‑deficit/hyperactivity disorder, intellectual disability, communication, and learning disorders. Male sex, any degree of prematurity, and being small for gestational age consistently elevated risk, underscoring the importance of early brain development windows. However, the magnitude of these associations varied: extreme prematurity amplified the hazard for intellectual disability more than fivefold, while congenital malformations showed a steep gradient, especially for severe intellectual disability. Maternal obesity proved a universal risk factor, with the strongest effect observed for ADHD, suggesting metabolic and inflammatory pathways may broadly disrupt neurodevelopment.

From a policy perspective, the findings call for targeted interventions. Preventing preterm birth and improving neonatal care could reduce the burden of intellectual disability, while smoking cessation programs for expectant mothers may curb ADHD incidence. The divergent socioeconomic patterns—higher ASD and ID diagnoses but lower ADHD detection in disadvantaged groups—signal potential under‑diagnosis and unequal access to services. Integrating these insights into public‑health strategies can refine early‑screening protocols, allocate resources more equitably, and guide future research into the biological mechanisms linking early exposures to specific neurodevelopmental trajectories.