In short: No, it's not possible to see or feel autism in the womb. There is no symptom, blood test, or ultrasound finding that can diagnose autism before birth.
If you typed this phrase into a search bar, it was probably late at night. Maybe you're expecting your second child and your first is autistic. Maybe a relative made an offhand comment about how much your baby kicks. Maybe you're autistic yourself and wondering whether pregnancy is supposed to feel this overwhelming.
Whatever brought you here, a straight answer is more useful than a list of vague "signs," so here it is again: autism can't be detected during pregnancy, and no kick pattern, scan result, or symptom you feel can tell you whether your baby will be autistic.
Research offers a more nuanced, and in places more interesting, picture. Scientists have found some pregnancy-related factors that are statistically linked with a higher chance of a later autism diagnosis, and autistic parents describe pregnancy in ways that clinicians are only starting to understand.
This article pulls those threads apart so you can tell what is solid evidence, what is early-stage research, and what is plain myth.
Three Questions Hiding in One Search
The phrase "signs of autism during pregnancy" blends together questions that deserve separate answers:
Can a baby show signs of autism before birth? No.
Are there pregnancy factors linked to autism later on? A few associations exist. Most are small, and none can diagnose anything.
What is pregnancy like when the parent is autistic? Often harder than it needs to be, for fixable reasons.
Why Autism Can't Be Detected in the Womb
Autism is identified through behavior: how a child communicates, relates to other people, plays, and responds to the world. A 2024 review of pregnancy-related factors says directly that there are no clinical or laboratory tests for autism, so evaluation rests on a child's developmental and behavioral history. A fetus can't show those behaviors yet, so clinicians have nothing to observe.
That's also why movement makes a poor clue. Babies differ in how much they kick, roll, and hiccup, and those differences depend on position, where the placenta sits, the time of day, and even what the parent just ate. I found no validated research tying a particular movement pattern to autism. If your baby's movements slow down or change noticeably, call your provider promptly, but do it for pregnancy-safety reasons, not autism ones.
What Fetal Ultrasound Research Has Found
Because ultrasound is routine, researchers have naturally wondered whether early brain differences might show up on a scan. So far, the results are intriguing but nowhere near diagnostic.
A large two-country study: Researchers tracked 3,820 children in the Netherlands and Australia, including 60 with a confirmed autism diagnosis, and compared fetal head growth with autistic traits later on. They found no consistent association across the two groups and no difference in prenatal head growth between autistic children and the rest. A weak link between smaller initial head size and later traits appeared in the Dutch group but not the Australian one.
A smaller Cambridge study: Scientists scanned 219 pregnancies at 12, 20, and 26 to 30 weeks, then followed 178 toddlers to 18 to 20 months. Cerebellar measurement at 20 weeks was associated with scores on a toddler autism-traits checklist. The authors themselves said the finding needs replication.
Statistical links across groups don't translate into predictions for one pregnancy. A routine anatomy scan is not designed to flag autism, and if a measurement looks unusual, your doctor will evaluate it for its own reasons, not as an autism warning.
Pregnancy Factors Linked With a Higher Likelihood of Autism
Researchers describe autism as multifactorial. Genes play a large role, and a handful of exposures during pregnancy may nudge the odds. The 2024 review mentioned above compiles that evidence. Treat everything below as association, not proven cause.
Family History and Genetics
Having a sibling or close relative with autism is among the clearest risk markers, and certain genetic conditions, such as fragile X syndrome, are linked with autism more often. The review also notes that autism is diagnosed about four times more often in boys, though some researchers think part of that gap reflects how diagnostic criteria were built around male presentation.
Medications, Especially Valproic Acid
Valproic acid, an anti-seizure and mood medication, carries the strongest evidence among drugs. One study cited in the review found autism in about 9 percent of children exposed to it. If you take valproate, do not stop on your own. Talk to your prescriber, ideally before conceiving, about safer alternatives. Findings on antidepressants called SSRIs are mixed, and untreated depression carries its own risks, so that decision belongs with your provider.
Pregnancy Conditions and Infections
Preeclampsia, gestational diabetes, maternal obesity, and infections, particularly viral infections in the first trimester, have all been associated with higher autism rates in some population studies. These conditions are monitored closely for many other reasons, so managing them well is simply good prenatal care.
Environmental Exposures
Air pollution has some of the more consistent findings. Two large California cohorts reported small increases, with hazard ratios roughly between 1.07 and 1.14 for fine particulate exposure. Evidence on pesticides and vitamin D is mixed. Effect sizes like these reflect population averages, not your baby. Public health agencies such as the CDC also list older parental age among associated factors, again as a small statistical shift.
What About Acetaminophen (Tylenol)?
This question has been loud since late 2025, so it deserves a careful answer. Some earlier studies reported a modest association between acetaminophen use in pregnancy and autism. Larger, better-designed studies since then, particularly those comparing siblings born to the same mother, have not found this association. A Swedish sibling analysis reported a hazard ratio of 0.98 for autism, and a 2026 Danish study of about 1.5 million children also found no significant association.
The American College of Obstetricians and Gynecologists reviewed the question in its ACOG advisory and concluded that the evidence does not support a causal link and that acetaminophen remains the safest first-line option for pain and fever in pregnancy. The FDA began a label-change process in September 2025, citing a possible association. As always, use any medication as directed, as needed, and check with your provider if you are unsure.
What Does Not Cause Autism
Please don't comb through your pregnancy looking for something you did wrong. For most autistic children, researchers cannot point to a single cause, and a statistical association in a large database isn't a verdict on one family's choices. Vaccines have been studied extensively and do not cause autism. Neither do parenting style or the ordinary stresses of daily life.
When the Pregnant Person Is Autistic
The other half of this topic gets far less attention. An online survey in the Journal of Autism and Developmental Disorders compared pregnancy experiences among 417 autistic and 524 non-autistic people. Earlier qualitative work, including interviews with small groups of autistic women, describes a consistent pattern:
Heightened sensory sensitivity: Smell, bright lights, sound, and touch can feel stronger, making exams and waiting rooms harder.
Communication barriers: Autistic patients often report that maternity staff misread their communication or pain responses.
Stigma and being unheard: Some feel unable to disclose a diagnosis, or feel dismissed when they do.
Stress and anxiety: Without accommodations, appointments themselves can become a source of strain.
Many autistic women also go through pregnancy undiagnosed because female presentation is often missed, so they have no language for what they're experiencing.
If this is you, a few small asks can change the experience:
Send your questions in writing before appointments and ask for written summaries afterward.
Request a quieter room, dimmer lights, or a warning before you are touched.
Ask for longer visits, or for the same provider each time.
Put your birth preferences and sensory needs on paper and share them early.
Bring a support person who can speak up when you are overloaded.
Early Signs After Birth, and Where to Learn More
The honest answer to "when can anyone start looking?" is after birth, and even then the picture builds gradually. Pediatric guidelines in the United States call for autism-specific screening at 18 and 24 months, alongside regular developmental check-ins. Earlier clues, such as how a baby responds to your smile or to play, can be informative but vary widely.
If you want to understand what parents actually notice, our articles on do babies smile and tickling responses cover two common questions. And because worry tends to over-read normal quirks, it is worth reading about false autism signs too.
If You're Worried During Pregnancy
Raise your concern with your OB or midwife; they hear this often.
If autism runs in your family, ask whether genetic counseling makes sense.
Review every prescription and supplement with your provider, and never stop a medication abruptly.
Keep chronic conditions such as diabetes and high blood pressure well managed.
Take prenatal vitamins as recommended and attend all prenatal visits.
Share your family history with your child's pediatrician so they can closely monitor early development.
Find Blossom ABA Support in Your State
If you already have a child who needs support, or want to understand what early help looks like, explore our area pages:
Georgia: ABA therapy in Georgia, including in-home, center-based, and community support
Tennessee: ABA therapy in Tennessee, with flexible scheduling built around family life
Virginia: ABA therapy in Virginia, with individualized, evidence-based programs
North Carolina: ABA therapy in North Carolina, with support at every stage of life
Maryland: ABA therapy in Maryland, with compassionate care close to home
Colorado: ABA therapy in Colorado, with programs built around each child's strengths
To protect your privacy, please reach out through our contact page or by phone rather than sharing pregnancy or medical details in public comments or on social media.
Frequently Asked Questions
Can autism be detected during pregnancy?
No. No test, ultrasound, or symptom can diagnose autism before birth. Diagnosis happens after birth, based on a child's development and behavior.
Can an ultrasound show signs of autism?
No. Studies have explored head size and brain measurements, but the findings are inconsistent and describe group averages, not individual babies.
Does fetal movement tell you anything about autism?
No validated research links kick patterns to autism. Reduced or changed movement should still be reported to your provider for pregnancy-safety reasons.
Is autism preventable?
Autism is not currently preventable. You can support a healthy pregnancy by managing medical conditions, reviewing medications with your provider, and attending prenatal care, which is good practice for many reasons.
Final Thoughts
The most useful thing to take from the research is also the least dramatic: there is no sign of autism to look for during pregnancy, and the factors scientists have identified are small, statistical, and mostly outside anyone's control. What you can do is stay informed, keep your prenatal care consistent, and speak up for your own needs, especially if you are autistic yourself.
Once your baby arrives, watching development with curiosity rather than dread, and asking early questions when something feels off, matters far more than anything that happened in the womb.
Sources
Botelho, Silva & Borbely (2024), The Autism Spectrum Disorder and Its Possible Origins in Pregnancy, International Journal of Environmental Research and Public Health
Blanken et al. (2018), A prospective study of fetal head growth, autistic traits and autism spectrum disorder, Autism Research
American College of Obstetricians and Gynecologists (2025), Acetaminophen Use in Pregnancy and Neurodevelopmental Outcomes
University of Cambridge, Fetal brain growth and infant autistic traits (ultrasound study of 219 pregnancies, Rosie Hospital)
Journal of Autism and Developmental Disorders (2022), online survey of pregnancy experiences among 417 autistic and 524 non-autistic people
