Prenatal Maternal Alcohol Exposure During the First Trimester of Pregnancy in Relation to Early Learning Ability, Behavioral Problems, and Autistic Traits in Preschool Children With or Without Autism Spectrum Disorder.
Even light first-trimester alcohol can slow learning and deepen social-communication gaps in preschoolers with ASD.
01Research in Context
What this study did
The team asked moms how much alcohol they drank in the first three months of pregnancy.
They then tested preschoolers with and without autism on learning, behavior, and social skills.
The design was quasi-experimental: kids were already exposed or not, no one told moms what to drink.
What they found
Three or more drinks a week raised acting-out behaviors in both groups.
Just one or two drinks a week slowed early learning and made social-communication worse, but only in the autism group.
Light drinking had no extra effect on typical kids, yet it still hurt the ASD kids.
How this fits with other research
Dixon et al. (2008) already showed prenatal alcohol can drive challenging behaviors; Stagnone et al. (2025) now pinpoints the first trimester and adds learning delays.
Varela et al. (2024) looks like a contradiction: in their clinic files maternal substance use pointed away from an ASD diagnosis. The key difference is timing and group. Enrique studied mixed-age clinic youth and any substance use across pregnancy, while H et al. focused on first-trimester alcohol in preschoolers already diagnosed with ASD. The papers do not really clash; they track different windows and samples.
Mao et al. (2026) used a similar preschool ASD vs. typical design and also found that an early toxicant (lead-cadmium) selectively worsens social skills in autistic children, backing the idea that kids with ASD are extra vulnerable to prenatal insults.
Why it matters
If you assess preschoolers with ASD, ask about first-trimester alcohol at intake. A simple question can flag kids who may need tighter social-communication and learning supports from day one.
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02At a glance
03Original abstract
Prenatal alcohol exposure has been linked to adverse neurodevelopmental outcomes. However, its effects on developmental outcomes in children with autism spectrum disorder (ASD) remain unclear. We examined associations between prenatal alcohol exposure during the first trimester (PAE-FT) and early learning ability, behavioral problems, and severity of autistic traits in preschool-aged children in a large multi-site case-control study, the Study to Explore Early Development. Children were classified as ASD (n = 1237) or population comparison without ASD (POP, n = 1334) after an in-person assessment covering cognitive abilities and detailed autistic traits. Mothers completed questionnaires on their child's behavior and autism-related traits, as well as their alcohol use during pregnancy. Of children in the ASD and POP groups, 18.5% and 20.2%, respectively, were exposed to PAE-FT. Exposure to 3 or more alcoholic drinks per week was associated with increased externalizing behaviors (i.e., attention deficits and aggressive behaviors) in children in both the ASD and POP groups, and with exacerbated social communication and interaction deficits in children with ASD only. First trimester exposure to 1-2 alcoholic drinks per week was associated with early learning delays for children in the ASD group, but not the POP group. As expected, our findings suggest that PAE-FT is associated with adverse behavioral development of children regardless of ASD status. However, PAE-FT may exacerbate autism-specific developmental problems and learning difficulties in children with ASD. Gathering a prenatal alcohol exposure history for children with and without ASD could contribute to a better understanding of developmental trajectories, aiding informed decisions for interventions and support.
Autism research : official journal of the International Society for Autism Research, 2025 · doi:10.1002/aur.2663