Signs Your Child May Need an Assessment for ADHD or Autism
You have been watching. The school keeps saying he needs to try harder. Your friends tell you kids grow out of these things. Your pediatrician says wait and see. And still, something in you knows there is more to it than that.
Most parents who come to my office have been in this exact place for months. Sometimes years. They arrive holding a mental list of small moments that added up to something. The way she covers her ears at birthday parties. The way he can list every fact about the solar system but cannot start a load of laundry. The way school looks fine on paper, but the meltdowns at home are getting worse.
If you are reading this, you are probably not looking for a hobby. You are looking for an explanation.
Here is what to know about the signs, why they are so often missed, and when it makes sense to consider an assessment.
Why It Can Be Hard to Tell If Your Child Has ADHD or Autism
Both conditions look different in every child. That is one of the honest reasons they get missed.
A quiet, well-behaved girl who reads early and pleases her teachers can absolutely be Autistic. A boy with a lot of friends who is invited to every birthday can absolutely have ADHD. The old ideas about what these presentations look like were built almost entirely on studies of a narrow group of young boys. If your child does not fit that template, they may have been slipping through every net designed to catch them.
There is also something called masking. Many children, especially girls, work very hard to appear neurotypical during the school day. They copy their peers. They study the rules. They perform. Then they come home and fall apart because the effort of holding it together for six hours has drained everything they had left.
If you have been told your child is fine at school but you are seeing something completely different at home, you are not making it up. Home is often where their real self shows up.
Common Signs of ADHD in Children
ADHD is not really about being loud or bouncy. It is a difference in how the brain regulates attention, action, and emotion. It shows up in three broad ways, and many children have some combination of all of them.
Inattentive signs:
Loses focus mid-sentence, mid-task, mid-conversation
Cannot start a task even when they want to, then cannot stop once they begin
Forgets things constantly, including things they care about
Struggles to follow multi-step directions
Daydreams often, seems "in their own world"
Reads a page and cannot recall what it said
Hyperactive and impulsive signs:
Cannot sit still, fidgets, climbs, or moves during quiet activities
Talks a lot, interrupts, blurts out answers
Struggles to wait their turn
Acts before thinking, often with regret afterward
Big emotional reactions, quick to escalate, quick to recover
Emotional signs that often go unnamed:
Rejection sensitivity, meaning small perceived criticism feels catastrophic
Time “blindness”, meaning they genuinely do not experience time the way others do
Difficulty with transitions between activities
One of the reasons parents often miss ADHD is that the child is bright. Very bright children can coast through elementary school on native intelligence, then hit a wall in middle school when the demands on organization outpace what they can compensate for. That is often when I start getting the calls.
Common Signs of Autism in Children
Autism is a difference in how a person experiences and communicates with the world. It is not a deficit. It is a whole way of being that has both strengths and challenges together.
In toddlers and preschoolers, you might notice:
Delayed speech or unusual speech patterns
Intense interest in one or two topics or activities
Meltdowns during transitions, especially unexpected ones
Sensory sensitivities to sound, texture, light, or taste
Prefers solo play, or plays next to other children rather than with them
Repetitive movements: hand flapping, rocking, spinning, lining up toys
Struggles with pretend play, or plays only in scripted ways
Very fussy about food textures, clothing tags, or bath water temperature
A need to repeat spoken rituals or songs
An interest in the parts of toys rather than using them as a whole
In elementary-age children, you might notice:
Trouble reading social cues, or reads them but cannot respond intuitively
Prefers rules and routines, becomes distressed when they change
Deep, focused or unusual interests that go far beyond typical hobbies
Speaks like a small adult, using formal or scripted language
Struggles with group work but does well one-on-one
Sensory overload after school, needs to shut down or stim to recover
Anxiety, perfectionism, or self-critical thoughts
Signs that get missed more often in girls:
Extremely well-behaved at school, then meltdowns at home
Copies other children's mannerisms to fit in
Deep interest in animals, characters, or fiction rather than the more stereotypical trains or facts
Anxiety and depression by middle school
Friendships that feel effortful and confusing
I want to say something important here. A child who can make eye contact, hug you, and tell you they love you can still be Autistic. Every one of those things is possible for an Autistic child. The idea that Autistic kids do not connect emotionally is one of the most damaging myths still floating around.
When ADHD and Autism Show Up Together (AuDHD)
Roughly half of Autistic children also meet criteria for ADHD, and the reverse is often true, too. The two conditions co-occur so often that many clinicians now think of them as sitting on overlapping ground rather than as separate categories. This is a big change from the previous diagnostic criteria, which did not allow the two to be diagnosed simultaneously.
When a child has both, they often look like they are pulling in two directions. The Autistic side wants routine, sameness, and depth. The ADHD side wants novelty, movement, and stimulation. Living inside that tension is exhausting. These children often struggle with executive function, which is the brain's ability to plan, initiate, and follow through on tasks. They can be brilliant and disorganized at the same time. They can hyperfocus on a special interest for four hours and forget to eat, and then be unable to start a two-minute chore.
If your child's presentation feels like a paradox, that might be why. AuDHD is common. It is also the presentation that gets missed most often.
How to Tell Typical Child Behavior From ADHD or Autism
Most children stim sometimes. Most children have big feelings. Most children hate transitions. Some things that would raise a flag in a specific child are simply part of being a person.
Here is how I think about it in the office. It is not usually about whether a child does a specific thing. It is about how much, how often, how intensely, and how much it interferes with their daily life.
A four-year-old who spins in circles when they are excited is a four-year-old. A four-year-old who spins for twenty minutes at a time, in the same corner, every day, to the point that it is hard to interrupt them for meals, is showing something worth looking at.
A ten-year-old who forgets his lunchbox once a month is fine. A ten-year-old whose backpack has become an archaeological dig and who cries every morning because he cannot find anything is showing something worth looking at.
You know your child. If your instinct is that something is different, take that instinct seriously.
When to Consider a Professional Evaluation
If you have been noticing patterns for six months or more, and your child's difficulties are affecting home life, school, or friendships, it is a reasonable time to look into an assessment.
You do not need to wait for a teacher to bring it up. You do not need to wait for things to get worse. Early understanding gives your child a chance to make sense of their own brain, before they have spent years believing something is wrong with them.
Assessment is not a verdict. It is a tool. A good assessment gives you a detailed picture of how your child's brain works, what they are good at, what is genuinely hard, and what kind of support might help. It gives you language for what you have been observing. And it gives your child, eventually, a way to understand themselves that is not "I am lazy" or "I am bad."
The thing I want every parent to know before they walk in for an assessment is this. A diagnosis, if there is one, is neutral news. It is not good news or bad news. It is information. What you do with it is where the story starts.
What Happens at a Comprehensive Assessment
Every clinician does this a little differently. Here is what a good assessment usually includes.
A long conversation with you about your child's development, from pregnancy to now
Direct observation of your child, ideally in a comfortable setting, using validated tools like the ADOS-2 or MIGDAS-2 for autism, and structured measures for ADHD
Cognitive and academic testing to see how your child learns
Questionnaires from you, and often from teachers, about behavior in different settings
A feedback session where the clinician walks you through the findings in plain language, not just an incomprehensible report
Recommendations for school, therapy, and home
Often, follow-up counseling to help the family integrate what they have learned
At my clinic, every assessment ends with a counseling session a few weeks after feedback. Because the report itself is only the beginning.
What a Diagnosis Actually Gives Your Child
Parents often ask whether a label will limit their child. The evidence, and my clinical experience, points the other way.
A diagnosis gives your child:
Language for the experience they have been having their whole life
Access to accommodations at school, without which many bright kids simply give up
Access to affirming therapy that fits their actual brain
A community of people who share their neurotype and can offer things you cannot as a parent
A defense against the story that says they are broken
Without it, many children build their identity around not being good enough. That story is much harder to undo at thirty than it is to prevent at eight.
Frequently Asked Questions
At what age can a child be assessed for autism or ADHD?
Autism can be reliably diagnosed from around age two. ADHD is typically assessed from around age five or six, though some presentations are clear earlier. Waiting is rarely helpful.
What is the hardest age for ADHD?
For many children, the hardest years are middle school. The demands on organization, self-regulation, and social navigation jump sharply while the brain support systems are still developing.
Can a child with ADHD or autism have a normal life?
Yes. Neurodivergent children grow into neurodivergent adults who lead full, complex, meaningful lives. What changes with early diagnosis and support is not who they are. It is how much unnecessary suffering they carry along the way.
How can I tell if it is ADHD or autism?
You often cannot from the outside. The two conditions share traits and can look nearly identical in some children. That is one of the reasons a comprehensive assessment that considers both is worth the investment.
What are the signs of ADHD in a two-year-old?
At two, most signs of ADHD are not yet distinguishable from typical toddler behavior. Extreme, persistent hyperactivity, sleep problems, or delayed impulse control that goes beyond what other toddlers show can sometimes be early indicators, but a formal ADHD diagnosis is rarely made this young.
Is delayed speech a sign of autism or ADHD?
Delayed speech is more strongly associated with autism than ADHD, though it can occur in both. Speech delay in isolation is not enough to indicate either. It is worth speaking to a pediatrician or speech-language pathologist to learn what might be contributing to your child’s speech delay.
What should I not say to a child with ADHD?
"Try harder." "Why can't you just focus?" "Other kids can do this, why can't you?" These messages, repeated over years, become the internal voice a child grows up with. The most helpful language names what is hard without blaming the child for it.
Are home testing kits for ADHD or autism reliable?
No. There are online screeners that can flag whether a full evaluation might be worthwhile, but there is no valid home testing kit for either condition. A real diagnosis requires direct observation, a developmental history, and validated clinical tools, interpreted by a specialist.
What are natural supplements that can help calm ADHD in children?
Omega-3 fatty acids have some evidence behind them. Beyond that, the evidence for supplements is limited. Consistent sleep, movement, protein-rich meals, and predictable routines have far more impact than most supplements, and they are free.
About Eleanor Palser, PhD
I am a licensed clinical psychologist based in San Francisco and the founder of The Neurodiversity Clinic. I hold a doctorate and post-doctoral training in clinical psychology, and I have spent my entire professional career working with neurodivergent children, teens, and adults.
I am trained in the gold-standard diagnostic tools for autism, including the ADOS-2, ADI-R, and MIGDAS-2, and I use comprehensive assessment batteries selected for each client. I also hold an appointment as an Assistant Professor at Palo Alto University, where I am the Director of Pediatric Behavioral Health and run the Affective Development Lab, where our research focuses on the emotional and mental health needs of neurodivergent people and how emotion and identity develop across the lifespan.
I am also neurodivergent myself. I was diagnosed with dyspraxia (also known as Developmental Coordination Disorder) during my PhD, and that experience shapes how I show up in this work. I know what it feels like to spend years wondering what is different about you and why some things are just so hard. I know what it feels like to finally get language for it. And I know how much both the difficulty and the gift of a neurodivergent brain shape a whole life.
The Neurodiversity Clinic offers autism, ADHD, and learning differences assessments for children from age two, teens, and adults. Every assessment includes a feedback session designed to be understandable and useful, a written report, and a follow-up counselling session a few weeks later. A diagnosis is the start of something, not the end.