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Dysmorphological and Neuropsychological Phenotypes of Prenatally Alcohol-Exposed 6-Year-Old Children: A Prospective
M Jolma1,2, E Wallén3, E Saure4
1Division of Child Neurology, Päijät-Häme Central Hospital, Lahti, Finland.
Insights
Prenatal alcohol exposure (PAE) causes significant developmental issues, with 76% of exposed children meeting Fetal Alcohol Spectrum Disorder (FASD) criteria. Early exposure is sufficient for lasting neurocognitive impairment.
Area of Science:
- Developmental Pediatrics
- Neuroscience
- Public Health
Background:
- Prenatal alcohol exposure (PAE) leads to Fetal Alcohol Spectrum Disorders (FASD) with diverse physical and neurodevelopmental effects.
- Understanding FASD etiology requires longitudinal studies of exposed and unexposed children.
Purpose of the Study:
- To characterize the phenotypic outcomes of children with substantial PAE.
- To assess dysmorphological, neurodevelopmental, and neuropsychological features at age 6.
Main Methods:
- Prospective birth cohort study with biological sample collection.
- Dysmorphological, neuropediatric, and neuropsychological assessments at 6 years in 28 PAE children and 52 controls.
Main Results:
- 76% of PAE children met FASD criteria; characteristic facial features and midface hypoplasia were noted.
- PAE associated with weight issues, lower cognitive scores, ADHD symptoms, and broader functional impairments.
- Early PAE (first 7 weeks) showed outcomes comparable to longer exposure durations.
Conclusions:
- Systematic follow-up and comprehensive phenotyping are crucial for improving FASD identification.
- Substantial PAE, even early in pregnancy, can cause significant neurocognitive impairment and FASD.
Background:
Prenatal alcohol exposure (PAE) disrupts embryonic development, resulting in variable fetal alcohol spectrum disorder (FASD) phenotypes characterized by dysmorphological and neurodevelopmental abnormalities. To elucidate the etiology of FASD, we established a prenatally recruited prospective birth cohort collecting biological samples at birth and longitudinal data from alcohol-exposed and unexposed control children.
Methods:
Dysmorphological, neuropediatric, and neuropsychological assessments were performed at 6 years of age in 28 children with substantial PAE and 52 control children.
Results:
Among the PAE group, 76% (19/25) of the children who completed the full evaluation met the diagnostic criteria for FASD, including five with fetal alcohol syndrome (FAS), six with partial FAS, seven with alcohol-related neurodevelopmental disorder, and one with alcohol-related birth defect. None of the tested children had a prior FASD diagnosis. In addition to the characteristic features of FAS, including short palpebral fissures, smooth philtrum, and thin vermilion border, several additional anomalies, such as mild midface hypoplasia, were significantly associated with PAE (p < 0.001). Also, PAE was associated with both underweight and overweight at 6 years of age, particularly among boys. Neurocognitive assessments revealed lower performance scores and a high prevalence of ADHD symptoms in PAE children compared with controls. Furthermore, PAE children exhibited additional phenotypic features not captured by the diagnostic FASD criteria, including impairments in adaptive and social functioning, somatic health problems, and reduced postural stability. Moreover, 11 children with early-only PAE limited to the first seven gestational weeks showed dysmorphic features and cognitive outcomes comparable to those of children with longer exposure.
Conclusions:
The high proportion of affected children demonstrates the need for systematic follow-up of those with PAE and comprehensive phenotypic characterization to improve FASD identification. Importantly, these findings indicate that substantial PAE limited to very early pregnancy is sufficient to result in FASD with clinically significant neurocognitive impairment.
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