Regional differences in autism and intellectual disability risk associated with cesarean section delivery.
C-section itself is unlikely to cause autism; surrounding regional and social factors explain the small added risk.
01Research in Context
What this study did
The team looked at birth records across US regions. They asked: do more C-sections mean more autism or intellectual disability?
They compared kids born by repeat C-section with kids born vaginally. They kept track of where each child was born.
What they found
Repeat C-section showed only a small bump in autism or ID odds. The bump changed by region; some places showed no rise at all.
The authors say the surgery itself is not the trigger. Instead, things that go with higher C-section rates raise risk.
How this fits with other research
Guisso et al. (2018) also hunted perinatal autism risks. They found infections and family history mattered, not delivery mode. Their work lines up with the new view that context beats surgery.
Chatzoglou et al. (2023) pooled 53 studies on autism plus epilepsy. The only solid link they found was intellectual disability. Like McQuaid et al. (2024), they show that ID status, not birth story, drives later issues.
Leng et al. (2024) tracked autism diagnosis timing in China. Migrant kids got diagnosed later. Both papers flag place and social factors as hidden movers of autism numbers.
Why it matters
When you read a chart labeled “born by C-section,” do not panic. The surgery is a red flag, not the fire. Probe instead for regional care gaps, maternal stress, or late prenatal visits. Add these social clues to your intake questions. You will spend less time blaming birth events and more time targeting real needs.
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02At a glance
03Original abstract
Prior epidemiological studies investigating the association between delivery mode (i.e., vaginal birth and cesarean section [C-section]) and autism spectrum disorder (ASD) and intellectual disability (ID) risk have reported mixed findings. This study examined ASD and ID risks associated with primary and repeat C-section within diverse US regions. During even years 2000-2016, 8-years-olds were identified with ASD and/or ID and matched to birth records [ASD only (N = 8566, 83.6% male), ASD + ID (N = 3445, 79.5% male), ID only (N = 6158, 60.8% male)] using the Centers for Disease Control and Prevention's Autism and Developmental Disabilities Monitoring Network methodology. The comparison birth cohort (N = 1,456,914, 51.1% male) comprised all births recorded in the National Center for Health Statistics corresponding to birth years and counties in which surveillance occurred. C-section rates in the birth cohort demonstrated significant regional variation with lowest rates in the West. Overall models demonstrate increased odds of disability associated with primary and repeat C-section. Adjusted models, stratified by region, identified significant variability in disability likelihood associated with repeat C-section: increased odds occurred for all case groups in the Southeast, for ASD only and ID only in the Mid-Atlantic, and no case groups in the West. Regional variability in disability risk associated with repeat C-section coincides with differences in birth cohorts' C-section rates. This suggests increased likelihood of disability is not incurred by the procedure itself, but rather C-section serves as a proxy for exposures with regional variability that influence fetal development and C-section rates.
Autism research : official journal of the International Society for Autism Research, 2024 · doi:10.1001/jamanetworkopen.2019.10236