Maternal pre-pregnancy weight and autistic-like traits among offspring in the general population.
Moms with obesity before pregnancy are nearly three times more likely to raise young adults who show high autism-like traits even without an ASD diagnosis.
01Research in Context
What this study did
The team asked a simple question: does a mom’s weight before pregnancy shape social-communication style in her grown child?
They tracked thousands of typical young adults who had never been diagnosed with autism. Each adult filled out a short checklist about social quirks and sensory likes.
The researchers then looked back at medical charts to see how heavy the moms were before they got pregnant.
What they found
Young adults whose moms had obesity before pregnancy were nearly three times more likely to score high on autism-like traits.
The traits were still in the normal range—no diagnoses—just more social awkwardness or rigid habits.
The jump was clear even after the team ruled out mom’s age, smoking, and birth weight.
How this fits with other research
Li et al. (2016) pooled five earlier studies and saw the same direction: obesity in moms nudges autism odds up a little. Their number was smaller because they only counted kids who actually had an ASD diagnosis.
Chezan et al. (2019) worked in the same year with the same exposure—pre-pregnancy BMI—but they hunted for full ASD and other delays in preschoolers. Again, the link held, showing the signal starts early and can bloom into different levels of need.
Raghavan et al. (2018) looked at the next step: rapid baby weight gain and high leptin levels tripled to octupled later ASD odds. Put together, the story runs like this: mom’s obesity → infant growth spike → lasting social-cognitive flavor.
Why it matters
You can’t change a client’s birth history, but you can ask about maternal obesity during intake. When you see social or sensory goals in a teen or adult with no ASD label, remember the trait may have prenatal roots. Use that context to set realistic expectations and to reassure families that “autistic-like” does not equal disorder—it just tells you which teaching strategies (clear rules, visual cues, sensory breaks) are likely to help.
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02At a glance
03Original abstract
There is an emerging body of evidence demonstrating that maternal obesity at the time of conception increases the risk for Autism Spectrum Disorders (ASD) among offspring. We explored whether pre-pregnancy weight was related to autistic-like traits among offspring not diagnosed with ASD. A large sample of women, recruited during the second trimester of pregnancy, had their height measured and reported their pre-pregnancy weight. These measurements were then converted to a Body Mass Index (BMI) using the formula: (weight in kilograms)/(height in metres2 ). At 19-20 years of age, 1238 offspring of these women completed a measure of autistic-like traits, the Autism-Spectrum Quotient (AQ). Regression analyses identified a positive association between increasing maternal pre-pregnancy BMI and increasing AQ Total Score amongst offspring; this association was maintained even after controlling for a range of variables including maternal/obstetric factors (age at conception, education, smoking, alcohol consumption, hypertensive diseases, diabetes, threatened abortion), paternal BMI at pregnancy, and child factors (parity, sex) (P < .01, R2 =.03). Chi-square analyses found that women with pre-pregnancy obesity (BMI ≥ 30) were more likely to have offspring with high scores (≥26) on the AQ (P = .01). Follow-up binary logistic regression analyses also accounting for the same obstetric and sociodemographic variables found that the offspring of women with pre-pregnancy obesity were at a statistically significantly increased risk of having high scores (≥26) on the AQ (OR: 2.80; 95% CI: 1.06, 7.43). This study provides further evidence that maternal pre-pregnancy obesity is associated with autism-like behaviors in offspring. Autism Research 2019, 12: 80-88. © 2018 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: The current study explored whether pre-pregnancy weight was related to autistic-like traits among offspring not diagnosed with ASD. We found that pre-pregnancy body mass index in women is associated with the amount of autistic-like traits in their children in early adulthood. Specifically, women who were obese at the time of conception were more likely to have a child who had high levels of autistic-like traits in early adulthood.
Autism research : official journal of the International Society for Autism Research, 2019 · doi:10.1002/aur.1973