No — IVF does not cause autism. One of the largest studies to date, a 2023 JAMA Network Open analysis of 1,370,152 children, found that children conceived through IVF or ICSI had a 16% higher relative risk of autism spectrum disorder (ASD) than naturally conceived children — but the absolute increase is only about 0.3 percentage points, and most of the difference is explained by the underlying infertility and pregnancy complications (twins, preterm birth, cesarean delivery), not by the treatment itself.
Data in this article is sourced from the Ontario, Canada population cohort study of 1.37 million children (Velez et al., JAMA Network Open 2023), the CDC National ART Surveillance System, and peer-reviewed medical literature, compiled by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board.
What Does a “16% Higher Risk” Actually Mean?
The confusion around “IVF causes autism” comes from mixing up two very different statistics:
| Term | Meaning | IVF example |
|---|---|---|
| Relative risk | How much higher the risk is compared with another group | aHR 1.16 = 16% higher than natural conception |
| Absolute risk | The actual chance of the outcome happening | About 2-3% of children overall are diagnosed with ASD |
In the Canadian cohort of 1.37 million children, the incidence of ASD was 1.93 per 1,000 person-years in the naturally conceived group — fewer than 2 new diagnoses per year for every 1,000 children followed. Even with a 16% relative increase, the absolute increase is roughly 0.3 percentage points, from about 2.0% to about 2.3%. That means more than 97% of IVF children do not develop autism.
Baseline context from the CDC: “An estimated 1 in 36 children (or 2.8%) has been identified with autism spectrum disorder (ASD)” — CDC Autism and Developmental Disabilities Monitoring (ADDM) Network, 2023.
What Exactly Did the JAMA 2023 Study Find?
The study (Velez et al., JAMA Network Open 2023) followed all live births in Ontario, Canada from 2006 to 2018:
| Mode of conception | Children | Adjusted hazard ratio for ASD |
|---|---|---|
| Unassisted conception | 1,185,024 | 1.00 (reference) |
| Infertility without treatment | 141,180 | 1.20 (95% CI, 1.15-1.25) |
| Ovulation induction / IUI | 20,429 | 1.21 (95% CI, 1.09-1.34) |
| IVF or ICSI | 23,519 | 1.16 (95% CI, 1.04-1.28) |
The key insight: women with untreated infertility had a 20% higher risk of children with ASD — higher than the IVF group. Infertility itself, not the treatment, is the common thread.
How to read this table: aHR (adjusted hazard ratio) compares the relative chance of autism across groups. An aHR of 1.00 means the same risk as unassisted conception; values above 1 mean higher risk — for example, 1.16 means a 16% increase.
Why Does the Elevated Risk Exist at All?
Infertility Is the Driver, Not the Procedure
The parents’ underlying diagnosis (advanced age, genetic factors, sperm or egg quality issues) contributes to neurodevelopmental risk regardless of how conception happens. The JAMA study controlled for maternal age and still observed the elevated risk.
However, the mediation analysis showed that when the effects of pregnancy complications are accounted for, much of the association disappears.
Pregnancy Complications Mediate the Risk
In the mediation analysis, obstetrical and neonatal factors explained a substantial share of the IVF-ASD association:
| Factor | Proportion of IVF-ASD association mediated |
|---|---|
| Multifetal pregnancy (twins/triplets) | 78% |
| Preterm birth (under 37 weeks) | 50% |
| Cesarean delivery | 29% |
| Severe neonatal morbidity | 25% |
This is actionable news: many of these factors are modifiable. Choosing single embryo transfer (SET) dramatically reduces twin pregnancies, which in turn reduces preterm birth — the single largest mediator.
Is ICSI Linked to Autism?
Earlier research (including a 2013 study covered by Reuters) suggested ICSI might be linked to autism and intellectual disability. Subsequent larger studies — including the 2023 JAMA cohort — found no significant difference between standard IVF and ICSI in autism risk.
The older signals were likely confounded by the reasons ICSI was used: male-factor infertility, often with older paternal age.
Are IVF Children Otherwise Healthy in the Long Run?
Autism is one of several neurodevelopmental outcomes studied in ART children. The overall picture from large cohorts:
- Most IVF children are healthy — the vast majority of studies show normal cognitive and motor development
- Slightly higher risks exist for a few outcomes, generally small in absolute terms and driven by multiple pregnancy and preterm birth
- Singleton, term IVF pregnancies show risks much closer to natural conception
The best thing you can do for long-term child health is to aim for a single, full-term pregnancy — that approach is also the safest strategy for the mother.
Can You Lower the Risk Before or During IVF?
- Choose single embryo transfer (SET) — especially if you are under 38 with good-quality embryos; this cuts the twin rate from about 20-30% to roughly 5% and reduces preterm birth.
- Optimize your health before treatment — manage weight, blood pressure, and any chronic conditions (diabetes, thyroid disorders) before starting.
- Use PGT-A if appropriate — screening embryos for chromosomal abnormalities can reduce the miscarriage rate and avoid transfers of embryos unlikely to implant.
- Aim for term birth — attend every prenatal monitoring visit; preterm birth is the strongest modifiable mediator of the autism association.
- Keep the absolute numbers in perspective — a 16% relative increase on a 2% baseline means about 97% of IVF children will not have ASD.
FAQ
Q: Does IVF cause autism?
No — IVF does not cause autism. The 2023 JAMA study of 1,370,152 children found a slightly higher relative risk (aHR 1.16) after IVF/ICSI, largely explained by the underlying infertility and pregnancy complications such as twins and preterm birth.
The absolute risk remains small: roughly 2-3% of children overall are diagnosed with ASD.
Q: Are IVF babies more likely to have autism than naturally conceived babies?
Slightly, yes — about 16% higher relative risk in one of the largest studies, which translates to roughly 0.3 percentage points in absolute terms (from about 2.0% to about 2.3%). More than 97% of IVF children do not develop autism.
Q: Is ICSI linked to autism?
Older studies suggested a possible link, but the largest recent cohort studies found no significant difference between standard IVF and ICSI in autism risk (aHR 1.16 covers both together). The earlier signals were likely due to confounding by male-factor infertility and paternal age.
Q: What is the absolute risk of autism in IVF children?
The baseline autism risk in the general population is about 2-3% (roughly 1 in 36 children in the US, per CDC ADDM data). After IVF, assuming the 16% relative increase applies, the absolute risk is approximately 2.3% — meaning over 97% of IVF children will not be diagnosed with autism.
Q: Does single embryo transfer reduce autism risk?
Indirectly, yes. Twin pregnancies are the strongest mediator of the IVF-autism association (78% in the JAMA mediation analysis), because twins have much higher rates of preterm birth.
Single embryo transfer cuts the twin rate from about 20-30% to roughly 5%, lowering preterm birth and its downstream neurodevelopmental risks.
Q: Do IVF children have other health problems?
Most IVF children are healthy and develop normally. Large studies — including cohorts of over 1 million children — show slightly higher rates of a few outcomes (preterm birth, low birth weight, and small increases in some congenital anomalies), but absolute risks are small and largely tied to multiple pregnancy.
Singleton, term IVF pregnancies have outcomes close to natural conception.
Q: Should I worry if I’m already pregnant after IVF?
The most useful thing you can do is focus on modifiable factors: attend all prenatal visits, monitor for preterm labor signs, and aim for a healthy full-term delivery. Your prenatal care team can help manage these risks, and the absolute risk of autism in your child remains under about 3%.
Q: Where can I see my clinic’s success and safety data?
Look for verified success rates: in the US, the CDC National ART Surveillance System publishes clinic-level success rates, and SART provides member-clinic data. Also ask each clinic about its single embryo transfer policy — with SET, twin rates fall to around 5%.
For international clinics, national registries such as the HFEA, UK publish comparable data.
How to Plan Your IVF Journey with Confidence
The evidence is reassuring but not zero-risk: IVF children have a small, measurable increase in autism risk that is driven more by why you needed treatment than by the treatment itself, and much of it is linked to multiple pregnancy — which you can largely avoid with single embryo transfer.
Practical next steps:
- If you have not started yet, ask your clinic about their single embryo transfer policy and their twin rate
- Review verified success rates in ProIVF’s hospital directory and compare clinics transparently
- Read the guides on how age affects IVF success and the IVF timeline from start to finish so you know what to expect at every step
- Talk to your reproductive endocrinologist about your personal risk profile — every patient is different
This article was written by the ProIVF Medical Editorial Team, reviewed by the ProIVF Medical Advisory Board, and is based on publicly available data from the CDC National ART Surveillance System, the JAMA Network Open 2023 cohort study (PMID 37983032), and peer-reviewed literature to provide objective, accurate information for patients.
Medical disclaimer: This article is for educational purposes only and does not replace professional medical advice. Always consult a qualified fertility specialist about your individual situation. Last updated: August 21, 2026.
