“It’s Not Their Fault” – Understanding the Biological Roots of Autism

One of the most powerful things I say to parents when they first come to me, often exhausted and full of guilt, is this:

“It’s not their fault.”

If you are a parent of an autistic child, please hold onto that.

Let me explain why.

Autism is a Brain-Based Condition

Autism is not caused by parenting style, screen time, or something you did or did not do.

Autism is a neurodevelopmental condition, which means it begins during brain development, before a child is even born. Modern science confirms this (Courchesne et al., 2007; Ecker et al., 2015).

Brain scans show that autistic children’s brains grow differently. Some parts are larger. Some areas are more connected, while others are less (Ameis and Catani, 2015). The brain quite literally processes the world in a different way – not wrong, just different.

This is not an opinion. This is seen on MRI scans, brain tissue studies, and neural activity tests. It is backed by decades of research.

There is Strong Genetic Evidence

Studies of identical twins show that autism often runs in families because of genetics. Genes play a big part, we now know of hundreds linked to autism (Tick et al., 2016; Sandin et al., 2017). Many of them are involved in how the brain forms, how neurons connect, and how the brain regulates itself (Satterstrom et al., 2020).

For some children, the genetic differences are inherited. For others, they happen randomly as cells divide, what scientists call “de novo” mutations. Either way, it is biological.

You did not cause this.

There Are Real Differences in How the Brain Works

Research has shown that autistic people often have:

• Different brain sizes in early development (Courchesne et al., 2001)
• Changes in how different parts of the brain talk to each other (Uddin et al., 2013)
• Imbalances in the brain’s chemistry, especially with serotonin, dopamine, and GABA (Horder et al., 2018; Pizzarelli and Cherubini, 2011)
• Differences in how the immune system works, both in the body and the brain (Estes and McAllister, 2015; Rose et al., 2012)

None of this can be explained by parenting. It is physical. It is biological. It is real.

Why This Matters

If you have been told you need to “try harder” or “do better” as a parent, please know this:

Autism is not a result of poor discipline, lack of social exposure, or too much affection (or not enough). These ideas are outdated and harmful.

Instead, your child’s behaviour reflects how their brain processes information, sensory input, emotion, and stress. It might look like “defiance” or “avoidance” but often it is simply survival (García Domínguez et al., 2021).

If we understand that autism is biological, we stop blaming families and start asking what support a child really needs.

What I Tell Parents

When I work with families, I start with these reminders:

• You did not cause this.
• Your child is not broken.
• Their brain is wired differently, and that is okay.
• Our job is not to fix them, it is to understand them.

The science backs this. And it gives us permission to stop chasing blame and start focusing on what works: safety, acceptance, and support that meets the child where they are.

Let Go of the Guilt

If you are reading this and feel like you have been carrying guilt, I want to offer you a moment to let it go.

There is no shame in having a neurodivergent child. There is only a misunderstanding, and that is what needs to change.

Autism is part of how the brain develops. And while it brings challenges, it also brings strengths.

Let’s focus on understanding, not blaming. On connection, not correction. On love, not fear.

Because when we stop asking, “What went wrong?”

We can ask, “What does this child need to thrive?”

And that changes everything.

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References (Harvard style)

Ameis, S. M. and Catani, M. (2015) ‘Altered white matter connectivity as a neural substrate for social impairment in Autism Spectrum Disorder’, Cortex, 62, pp. 158–181.

Courchesne, E., Karns, C. M., Davis, H. R., Ziccardi, R., Carper, R. A., Tigue, Z. D., Chisum, H. J., Moses, P., Pierce, K., Lord, C., Lincoln, A. J., Pizzo, S., Schreibman, L., Haas, R. H., Akshoomoff, N. A. and Courchesne, R. Y. (2001) ‘Unusual brain growth patterns in early life in patients with autistic disorder: an MRI study’, Neurology, 57(2), pp. 245–254.

Courchesne, E., Mouton, P. R., Calhoun, M. E., Semendeferi, K., Ahrens-Barbeau, C., Hallet, M. J., Barnes, C. C. and Pierce, K. (2007) ‘Neuron number and size in prefrontal cortex of children with autism’, JAMA, 306(18), pp. 2001–2010.

Estes, M. L. and McAllister, A. K. (2015) ‘Immune mediators in the brain and peripheral tissues in autism spectrum disorder’, Nature Reviews Neuroscience, 16(8), pp. 469–486.

García Domínguez, D. J., Gómez-Mármol, A. and García-García, J. (2021) ‘Understanding demand avoidance in autism spectrum conditions: A narrative review’, International Journal of Environmental Research and Public Health, 18(24), 12861.

Horder, J., Petrinovic, M. M., Mendez, M. A., Bruns, A., Takumi, T., Spooren, W., Barker, G. J. and Murphy, D. G. M. (2018) ‘Glutamate and GABA in autism spectrum disorder – a translational magnetic resonance spectroscopy study in man and rodent models’, Translational Psychiatry, 8(1), 106.

Pizzarelli, R. and Cherubini, E. (2011) ‘Alterations of GABAergic signaling in autism spectrum disorders’, Neural Plasticity, 2011, Article ID 297153.

Rose, D. R., Careaga, M., Van de Water, J., McAllister, A. K. and Ashwood, P. (2012) ‘Long-term altered immune responses following prenatal immune activation in a mouse model of autism’, Brain, Behavior, and Immunity, 26(3), pp. 343–350.

Sandin, S., Lichtenstein, P., Kuja-Halkola, R., Larsson, H., Hultman, C. M. and Reichenberg, A. (2017) ‘The heritability of autism spectrum disorder’, JAMA, 318(12), pp. 1182–1184.

Satterstrom, F. K., Kosmicki, J. A., Wang, J., Breen, M. S., Rubeis, S. D., An, J. Y., Peng, M. et al. (2020) ‘Large-scale exome sequencing study implicates both developmental and functional changes in the neurobiology of autism’, Cell, 180(3), pp. 568–584.e23.

Tick, B., Bolton, P., Happé, F., Rutter, M. and Rijsdijk, F. (2016) ‘Heritability of autism spectrum disorders: a meta‐analysis of twin studies’, Journal of Child Psychology and Psychiatry, 57(5), pp. 585–595.

Uddin, L. Q., Supekar, K., Lynch, C. J., Khouzam, A., Phillips, J., Feinstein, C., Ryali, S., Menon, V. (2013) ‘Salience network–based classification and prediction of symptom severity in children with autism’, JAMA Psychiatry, 70(8), pp. 869–879