Proximity of Maternal Time of Immigration to Child's Birth Is Associated With Autism Spectrum Disorder With Early Learning Delay Among Immigrant Populations in the United States: Findings From the Study to Explore Early Development.
Very recent maternal immigration raises the chance of autism paired with early learning delay, not autism by itself.
01Research in Context
What this study did
Aiona et al. (2025) looked at US families where the mother moved from another country.
They asked: does it matter how close the move was to the child’s birth?
Kids were sorted into three groups: autism plus early learning delay, autism alone, or delay alone.
The team used a case-control design to compare timing of immigration across these groups.
What they found
Mothers who arrived shortly before giving birth were more likely to have children with autism plus learning delay.
The same close timing link showed up for delay alone, but not for autism alone.
In plain words, recent immigration mattered only when learning problems were also present.
How this fits with other research
Duker et al. (1996) first noticed that many Swedish autism cases had immigrant parents.
Kaylynn et al. now refine that signal: the risk is tied to late-arrival moms and only when delay co-occurs.
Lyall et al. (2014) saw maternal autoimmune disease raise odds of ASD plus DD, not ASD alone.
The new study swaps immigration timing for illness, yet the pattern—ASD+DD is sensitive, ASD alone is not—repeats.
Xu et al. (2014) and Connolly et al. (2016) link maternal diabetes or obesity to plain ASD; Kaylynn’s finding does not, showing different prenatal triggers may shape different developmental profiles.
Why it matters
When you intake an immigrant family, note when Mom entered the country.
If arrival was close to birth and the child shows developmental lag, consider extra screening and early-intervention referral.
The data say nothing about culture causing autism; they flag timing as one more risk layer you can track alongside medical history.
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02At a glance
03Original abstract
Our objective was to examine the relationship between the timing of parental US immigration and autism spectrum disorder (ASD) without early learning delay (ELD), ASD with ELD, and ELD alone among US-born children. We analyzed data from a multi-site case-control study that recruited children aged 2-5 years with ASD or non-ASD developmental disorders and same-age population controls. Parental demographics were collected from caregivers at study enrollment. Mullen Scales of Early Learning ≤ 70 was used to define ELD. Among children with a non-US-born parent (N = 1048), we used multinomial logistic regression to examine time from parental immigration to the child's birth in relation to ASD alone, ASD with ELD (ASD + ELD), and ELD alone compared to population controls. Having a non-US-born mother (regardless of the father's birthplace) versus a non-US-born father only was evaluated as a potential effect modifier. Among those with a non-US-born mother, closer proximity of maternal time of immigration to the child's birth is associated with increased odds for ASD + ELD and ELD alone. There was no significant association between years since US arrival and ASD alone. Among those with a non-US-born father only, we did not observe a significant relationship between time since paternal US arrival and ASD/ELD categories. Our study suggests that time-varying exposures among immigrant mothers may be of importance for the development of ASD + ELD and ELD alone in the offspring. These results may inform research into the etiology of ASD and ELD and ways to support immigrant women of childbearing age.
Autism research : official journal of the International Society for Autism Research, 2025 · doi:10.1002/aur.70133