If you’ve ever found yourself asking, “Why is my child always running around?” or “Why does my preschooler keep climbing furniture?”—you are not alone.
As a preschool teacher, I see it every single day.
Some tiny humans are zooming around the classroom during circle time. Some are climbing shelves like tiny mountain goats. Some are spinning in circles, crashing into pillows, or bouncing from toy to toy without slowing down. Others may avoid noisy spaces, struggle with transitions, or have big feelings over the “wrong” color cup.
To the outside world, these behaviors can look like bad behavior.
But in early childhood…
behavior is communication.
Understanding Autism Spectrum Disorder vs Attention Deficit Hyperactivity Disorder in preschoolers can help parents and teachers recognize the difference between impulsive behavior, hyperactivity, sensory-seeking behavior, and emotional dysregulation in young children (Centers for Disease Control and Prevention [CDC], 2025).
And when we understand the “why” behind the behavior, we can respond with more patience, support, and compassion.
Attention Deficit Hyperactivity Disorder is a neurodevelopmental condition that affects attention, impulse control, and activity levels (CDC, 2025).
In preschool, ADHD may look like:
- Running during circle time
- Blurting out answers before the question is finished
- Bouncing from toy to toy
- Climbing furniture because it looks fun
- Forgetting directions quickly
- Struggling to wait for a turn
- Having big emotional reactions when frustrated
These are often the children who seem to be “always on.”
They may truly want to listen…
…but their body moves before their brain catches up.
That’s not always defiance.
That may be impulsivity.
What Is Autism in Preschoolers?
Autism Spectrum Disorder affects communication, social interaction, behavior patterns, and sensory processing (CDC, 2025).
In preschool, autism may look like:
- Running when the room feels overwhelming
- Climbing for body pressure or sensory input
- Repeating words, songs, or phrases
- Lining up toys instead of playing traditionally
- Avoiding loud sounds or bright lights
- Struggling with eye contact or social cues
- Becoming upset when routines change
These children are not trying to be “difficult.”
Sometimes their behavior is their way of saying:
“This room is too loud.”
“My body needs movement.”
“I need pressure.”
“I need space.”
“I don’t understand what’s happening next.”
And if they cannot say it with words, they may say it with behavior (Autism Speaks, 2025).
Many autistic children seek vestibular input (movement and balance) and proprioceptive input (body awareness).
Climbing, jumping, crashing, and running can help them:
- Feel calm
- Release energy
- Regulate emotions
- Understand where their body is in space
- Cope with sensory overload
This is called sensory-seeking behavior.
In simple preschool teacher terms?
Their body may be asking for movement.
Why Do Kids With ADHD Run and Climb?
Children with ADHD may run and climb because of:
- Impulsivity
- Boredom
- Understimulation
- Difficulty inhibiting movement
- Desire for excitement or novelty
Their body may move before they think.
Why Autism and ADHD Can Look Similar
This is where many parents and teachers get confused.
Both autism and ADHD can involve:
- Hyperactivity
- Difficulty focusing
- Emotional outbursts
- Social struggles
- Trouble with transitions
- Movement-seeking behaviors
Some children may have both autism and ADHD, which can make understanding behaviors even more complex (National Institute of Mental Health [NIMH], 2025).
This is why looking at behavior alone does not tell the full story.
In my classroom, I often stop and ask myself:
“What is this child trying to tell me?”
A child running because they’re distracted and impulsive?
→ Could be ADHD.
A child running because the room is too loud or overstimulating?
→ Could be sensory overload.
A child climbing because it looks fun and they acted before thinking?
→ Could be impulsivity.
A child climbing the same shelf over and over because they need pressure or movement?
→ Could be sensory seeking.
Same behavior.
Different message.
Tiny humans are complicated like that.
How I Support Children With Autism or ADHD in My Classroom
In my classroom, I’ve learned that connection works better than correction.
Some strategies that help are:
- Movement breaks throughout the day
- Visual schedules and routines
- Calm-down corners
- Heavy-work activities like pushing chairs or carrying books
- Sensory bins and fidgets
- Simple one-step directions
- Predictable routines
- Extra patience and lots of grace
If your little one struggles with big emotions, you may also enjoy reading Big Feelings, Tiny Humans: How I Guide Emotions in My Classroom, where I share how I help children regulate their feelings in a preschool setting.
Using step-by-step guidance can make a huge difference. In Thoughts on Scaffolding: Supporting Tiny Humans One Step at a Time, I share how breaking tasks into smaller steps helps children succeed.
I also talk more about behavior and listening in Why Tiny Humans Don’t Listen, where I explain why children may struggle to follow directions.
Because children do well when they can.
And when they can’t…
they may just need us to understand them a little better.
Final Thoughts From a Tiny Humans Teacher
Some kids are not “wild.”
Some are sensory seekers.
Some are impulsive movers.
Some are overwhelmed.
Some are all of the above.
And honestly…
sometimes circle time only lasts three minutes over here too.
For a peek into the reality of preschool life, read A Day in a Preschool Classroom: What Tiny Humans Really Do All Day.
But when we stop seeing behavior as “bad” and start seeing it as communication, everything changes.
And sometimes the tiny human climbing your bookshelf…
isn’t trying to make your day harder.
They’re just trying to make their body feel right.
— Love, Jenny 💛
Can a child have both autism and ADHD?
Yes. Some children are diagnosed with both autism and ADHD. Since the two conditions share overlapping traits, it can sometimes take time to understand which behaviors are connected to which need (NIMH, 2025).
Why do autistic children climb furniture?
Many autistic children climb because they are seeking sensory input, body pressure, or movement. This can help them regulate their bodies and emotions.
Why is my child always running around?
Children may run due to impulsivity, excitement, sensory needs, overstimulation, or simply needing movement.
You May Also Enjoy
Looking for more preschool teacher tips and real classroom stories? Explore more on Growing With Tiny Humans:
• Big Feelings, Tiny Humans: How I Guide Emotions in My Classroom
• Why Tiny Humans Don’t Listen
• Thoughts on Scaffolding: Supporting Tiny Humans One Step at a Time
• A Day in a Preschool Classroom: What Tiny Humans Really Do All Day
Centers for Disease Control and Prevention. (2025). Attention-Deficit / Hyperactivity Disorder (ADHD). https://www.cdc.gov/adhd/
Centers for Disease Control and Prevention. (2025). Autism Spectrum Disorder (ASD). https://www.cdc.gov/autism/
Autism Speaks. (2025). Signs of Autism. https://www.autismspeaks.org/signs-autism
National Institute of Mental Health. (2025). Attention-Deficit/Hyperactivity Disorder. https://www.nimh.nih.gov
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