Developmental trauma, ADHD or autism: when the diagnosis isn't the one you were given

Your child has an ADHD diagnosis. Or an autism diagnosis. Or an attachment disorder diagnosis. The medication, the strategies, the school support, none of it is quite working the way the professionals said it would.

Many adoptive parents eventually arrive at the same uncomfortable question. Is this actually what my child has?

What is developmental trauma?

Developmental trauma is the umbrella term for the neurodevelopmental impact of chronic adversity in early childhood, particularly before the age of three. It was formally proposed as a distinct diagnostic category by Bessel van der Kolk and colleagues in work supported through what is now known as the Developmental Trauma Disorder framework. Bruce Perry's Neurosequential Model is the related clinical approach most widely used in UK adoption services.

Both frameworks share the same core observation. Children who experienced neglect, caregiving disruption, or other chronic early stress do not simply catch up when their circumstances change. The patterns their nervous systems learned become part of how they are wired, and those patterns affect attention, learning, emotional regulation, social behaviour, and sensory processing in ways that look like several other conditions.

Why developmental trauma gets missed in UK adoption

Developmental Trauma Disorder is not a formal diagnosis in either the DSM-5 or the ICD-11. This matters practically, because UK clinical pathways run through those classification systems. A paediatrician or CAMHS clinician who sees an adopted child with poor attention, difficult behaviour, and social struggle will look at the diagnostic manual and find ADHD, autism, or attachment disorder.

Any of these may genuinely fit. But all of them can also miss the trauma context underneath, and the strategies that follow from each diagnosis differ significantly from the strategies that help a child whose core issue is developmental trauma.

Adoption UK's annual Barometer surveys have for years flagged this diagnostic gap as one of the most consistent sources of frustration for adoptive families. Children receive one diagnosis, then another, then a third, before anyone considers the trauma overlay.

How to think about the overlap

ADHD, autism and developmental trauma genuinely share many surface features. Difficulty with attention and executive function. Emotional dysregulation. Sensory sensitivities. Social and relational challenges. Sleep disturbance.

What differentiates them is the mechanism underneath. ADHD and autism are primarily neurodevelopmental, meaning the differences in the brain exist independent of experience. Developmental trauma is primarily experience-dependent, meaning the brain changes happened in response to specific early circumstances.

These are not mutually exclusive. A child can have both ADHD and developmental trauma. A child can be autistic and also have developmental trauma. In fact, for many adopted children, the honest picture is layered rather than clean.

What a trauma-informed assessment looks like

A good diagnostic process for an adopted child should include detailed developmental history, pre-adoption records where available, observation across settings, and specific tools for trauma symptoms. The Anna Freud National Centre for Children and Families trains clinicians in approaches that account for the trauma context in UK children, and CoramBAAF publishes practice guidance for professionals working with adopted children's mental health needs.

If your child has been assessed only through a short clinical appointment that did not include the adoption history or pre-placement records, the diagnosis you received may be partially right rather than complete.

What to do if you suspect developmental trauma was missed

Start by raising the question specifically with your child's current clinician. The phrase to use is: has developmental trauma been considered in the differential? That one sentence often changes the direction of the conversation.

If you need a second opinion, your post-adoption support service may be able to signpost you to a trauma-informed clinician, often in private practice given current UK NHS capacity. The Adoption Support Fund can sometimes fund assessment.

For school support, the Pupil Premium Plus for adopted children can be used flexibly, including for trauma-informed interventions, if your child's school is willing to collaborate on an appropriate plan.

What changes when the picture includes trauma

When developmental trauma is recognised as part of what is going on, the parenting and support approach shifts. Behaviour that was being read as deliberate becomes nervous-system-driven. Consequences that were escalating become connection-based responses. School support that was pushing becomes scaffolding.

This is not a repudiation of ADHD or autism diagnoses where they apply. It is an additional layer of understanding that often makes the existing diagnoses work better in combination with trauma-informed support.

For many adoptive families, the point at which developmental trauma is finally named is also the point at which things start to make sense, including the things that had been not quite working for years.

Thanks for reading,

The Walk Together team