Do Vaccines Cause Autism? What the Science Actually Shows.

By Dr. Suzanne Goh, Pediatric Neurologist & Chief Medical Officer, Cortica

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Few topics in pediatric health carry as much emotional weight as the question of vaccines and autism. I want to speak to it honestly — as a scientist, as a clinician who has cared for thousands of autistic children, as a mother, and as someone who believes that parents deserve thoughtful, respectful engagement with this topic rather than dismissal.

So let me walk you through what the evidence actually shows, where legitimate medical individualization fits in, and how I approach this conversation in my own clinical practice.

What Does the Research Show?

Physicians and scientists frequently point to the large and consistent body of scientific evidence on this question. Studies involving millions of children across North America, Europe, and Asia have not found a causal link between childhood vaccines and autism.

These studies span different countries, different health systems, different vaccine schedules, and different research methods — and they arrive at the same conclusion. The question of whether routine childhood immunization causes autism has been examined rigorously and repeatedly, and the scientific consensus is that research done to date does not support that connection.

Is There Ever a Reason to Adjust a Vaccine Schedule?

This is a nuanced question, and one worth answering honestly: yes, there are specific medical circumstances where a personalized approach to immunization makes clinical sense. These include situations such as:

A child who is experiencing moderate or severe acute illness — when the body is already under significant stress, timing adjustments may be appropriate
Children with certain immune system conditions, such as those undergoing chemotherapy or taking strong immune-suppressing medications, where specific vaccines (particularly live vaccines) may require modified timing or spacing
A child who previously had a documented severe allergic reaction to a vaccine component
Recent receipt of blood transfusion or immune globulin therapy, which can interfere with how certain vaccines work
Specific circumstances in premature infants, where clinical stability may guide timing
Other acute or chronic childhood medical conditions where individualized clinical decision-making should take place because of unique metabolic, immune, neurological, or other factors, rather than adhering to general pediatric public health guidelines.

These are well-recognized, evidence-based reasons to individualize a vaccine plan — and they are entirely different from concerns about autism risk. Importantly, none of these situations represent a reason to forgo vaccination altogether; they are about thoughtful timing and medical management.

How Should You Approach This With Your Child's Doctor?

Every medical decision involves weighing potential benefits against potential risks. Vaccines protect against serious, sometimes life-threatening illnesses — measles, whooping cough, meningitis, and others. The risks of those diseases are real, and they disproportionately affect young children.

At the same time, I deeply believe that the decision about how and when to vaccinate your child should happen in conversation with a physician who knows your child, knows your family's medical history, and takes your questions seriously — not one who dismisses your concerns or makes you feel judged for asking them.

In my practice, I talk about vaccines with families regularly. I ask about family history. I listen to concerns. I explain the evidence. And together, we make decisions that I believe are in the best interest of each child. That is how medicine should work.

If you have concerns about your child's vaccine schedule, I encourage you to bring them to your pediatrician or a physician who specializes in autism medicine. Ask your questions. Expect thoughtful answers. Expect to be heard.

A Note on Guilt and Blame

Over the years, I have sat with many parents who are carrying guilt — wondering whether something they did, or didn't do, contributed to their child's autism. I want to speak directly to that: the science does not support the idea that any routine parenting decision caused your child's autism.

Autism emerges from the complex, layered interaction of genetics and development. It is not caused by a single event, a single decision, or a single moment. It is not your fault. And it is not a tragedy — it is a different way of developing, thinking, and experiencing the world.

Our role as clinicians, parents, and advocates is to understand each child's unique neurology as deeply as we can — and to build the right environment, the right supports, and the right care around what that particular child needs to thrive.

The Bottom Line

The scientific evidence does not support a link between routine childhood vaccination and autism. At the same time, good medicine always involves individualization — and there are specific, well-defined circumstances where discussing your child's vaccine timing with a knowledgeable physician makes sense.

Most importantly: your questions are valid. You deserve honest, evidence-based answers. And the goal — for all of us — is the same: making the decisions that best protect and support your child's health and development.

Dr. Suzanne Goh is a pediatric neurologist, board-certified behavior analyst, and Chief Medical Officer at Cortica, a national healthcare organization specializing in integrated care for autistic children and their families.

Do Vaccines Cause Autism? What the Science Actually Shows