Developmental windows of vulnerability: Substance-specific effects of prenatal exposure timing on child psychopathology.

Abstract

Prenatal alcohol, tobacco, and cannabis exposure are known risks for childhood psychopathology symptoms, but gaps persist in identifying substance-specific developmental vulnerability windows. Exposure timing relative to maternal pregnancy awareness may alter outcomes, yet this temporal specificity remains unclarified, limiting targeted risk assessment and prevention. Data from 7777 children in the Adolescent Brain Cognitive Development Study (enrolled 2016-2018) were analyzed. Prenatal substance exposure timing was categorized as pre-awareness (exposure before maternal awareness of pregnancy) and post-awareness (exposure after maternal awareness of pregnancy). Six domains of childhood psychopathology symptoms were assessed via the Child Behavior Checklist (CBCL). Linear mixed-effects models were applied to investigate the timing effects of prenatal substance exposure on childhood psychopathology symptoms, adjusting for covariates. The analysis revealed distinct temporal patterns of risk for each substance. Childhood psychopathology symptoms were specifically linked to pre-awareness exposure for alcohol and post-awareness exposure for cannabis. In contrast, post-awareness alcohol use and pre-awareness cannabis use showed no significant associations. Prenatal tobacco exposure conferred modest risks across all timings without temporal divergence. Prenatal substance exposure has substance-specific, timing-dependent effects on childhood psychopathology relative to maternal pregnancy awareness. Findings support distinct developmental vulnerability windows, highlighting the need to include substance type and timing in public health guidelines and clinical risk stratification.