Low to Moderate Prenatal Alcohol Exposure and Facial Shape of Children at Age 6 to 8 Years.
Level 3 - non-randomized controlled study
Prospective non-randomized controlled cohort study
PubMed 39928322 · doi:10.1001/jamapediatrics.2024.6151
What was done
A prospective cohort study in Melbourne, Australia recruited pregnant women during their first trimester from public maternity clinics. Three-dimensional craniofacial imaging was conducted on 549 children of European descent at 12 months (n = 421) and 6 to 8 years of age (n = 363), with 235 children imaged at both time points. Researchers evaluated associations between predominantly low to moderate prenatal alcohol exposure (first trimester only or throughout pregnancy) and non-exposed controls using hierarchical facial segmentation across 63 modules, principal component analysis, and response-based imputed predictor (RIP) scores. Findings were compared against a clinical reference sample of children with diagnosed fetal alcohol syndrome.
What was found
Prenatal alcohol exposure was consistently associated with subtle shape variations in the eyes (module 15 at 6–8 years: RIP partial Spearman ρ = 0.19 [95% CI, 0.10–0.29; P < .001]) and the nose (module 5 at 6–8 years: RIP partial Spearman ρ = 0.19 [95% CI, 0.09–0.27; P < .001]) at both 12 months and 6 to 8 years. These shape changes occurred with exposure in the first trimester alone or throughout pregnancy. Observed variations differed from classical fetal alcohol syndrome phenotypes, and no linear dose-response relationship was supported.
Why it matters
This study demonstrates that low to moderate prenatal alcohol exposure is linked to subtle craniofacial alterations that persist into mid-childhood, even though these changes do not match the diagnostic facial dysmorphology of fetal alcohol syndrome.
Limits
The study included only children of European descent from low-risk metropolitan clinics, limiting generalizability. Only 235 of 549 children (42.8%) completed imaging at both time points. Alcohol exposure was assessed observationally without biomarker verification, and the clinical or functional relevance of these subclinical facial variations was not evaluated.