Fetal Alcohol Spectrum Disorders: How Prenatal Alcohol Exposure Causes Lifelong Physical, Cognitive, and Behavioral Impairments

No amount of alcohol is safe during pregnancy. Alcohol is a teratogen that crosses the placenta freely; the fetus lacks alcohol dehydrogenase and cannot metabolize it effectively.

Mechanisms of Damage

• Cell Death: Apoptosis of neural crest cells, developing neurons.
• Disrupted Migration: Neurons fail to reach correct cortical layers.
• Oxidative Stress: Free radicals damage DNA, proteins, lipids.
• Epigenetic Alterations: DNA methylation, histone modifications persist lifelong.
• Growth Factor Interference: IGF, FGF, BDNF signaling disrupted.

Fetal Alcohol Spectrum Disorders (FASD)

• Fetal Alcohol Syndrome (FAS): Full triad — growth deficiency, characteristic facial features (smooth philtrum, thin vermillion border, short palpebral fissures), CNS abnormalities.
• Partial FAS (pFAS): Some features + confirmed exposure.
• Alcohol-Related Neurodevelopmental Disorder (ARND): CNS deficits without facial features.
• Alcohol-Related Birth Defects (ARBD): Congenital anomalies (heart, kidney, skeletal, auditory, ocular).

Neurobehavioral Impact

Executive dysfunction, ADHD-like symptoms, learning disabilities, memory deficits, poor impulse control, social cognition deficits, mental health comorbidities.

Prevention

Complete abstinence from conception through breastfeeding. Universal screening (AUDIT-C, T-ACE) in prenatal care. Brief intervention reduces consumption.