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Updated: Jul 4, 2026
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Published on: July 13, 2014
Sensitive periods for prenatal alcohol exposure shape internalizing symptoms across development
Medrxiv : the Preprint Server for Health Sciences
|July 3, 2026
Summary
Prenatal alcohol exposure (PAE) in the second and third trimesters is linked to increased risk of progressive depressive symptoms in children. Early or low-dose PAE did not show significant associations.
Area of Science:
- Neuroscience
- Developmental Psychology
- Public Health
Background:
- Prenatal alcohol exposure (PAE) is a leading cause of preventable birth defects and neurodevelopmental disorders.
- PAE is associated with long-term cognitive deficits and quadrupled risk for adult depression.
- The specific sensitive periods during pregnancy for PAE's impact on internalizing symptoms remain unclear.
Purpose of the Study:
- To investigate the association between the timing and dosage of prenatal alcohol exposure (PAE) and longitudinal trajectories of internalizing symptoms from childhood to adolescence.
- To identify specific trimesters during which PAE poses a greater risk for developing depressive symptoms.
Main Methods:
- Prospective cohort study using data from the Avon Longitudinal Study of Parents and Children (ALSPAC) with 6,409 participants.
- Growth mixture modeling was used to identify distinct trajectories of internalizing symptoms (measured by SDQ) from ages 4 to 16.5 years.
- PAE was categorized by trimester (first, second, third) and dosage (unexposed, low, high).
Main Results:
- Five distinct depressive symptom trajectories were identified, with the majority (75.9%) showing stable low symptoms.
- PAE in the second and third trimesters, particularly at high dosages, significantly increased the risk for a 'progressive increase' trajectory of depressive symptoms.
- PAE in the first trimester or low dosages showed no association with depressive symptom trajectories.
Conclusions:
- The second and third trimesters appear to be sensitive periods for PAE's detrimental effects on the development of depressive symptoms.
- Findings can inform targeted prevention programs and interventions for children at risk of depression due to PAE.
- Understanding critical windows of vulnerability can aid in public health messaging and clinical guidance regarding alcohol consumption during pregnancy.
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