Why is it so hard for two- and three-year-olds to cooperate? The answer lies in brain development.
During the recent long holiday, my three-year-old nephew came to Melbourne to spend time with us. After a few days, my brother-in-law looked visibly exhausted. He smiled helplessly and said he was completely drained, because his child seemed to be constantly testing limits and almost never truly “listening.”
He asked me, “What can we do to help him cooperate more?”
This is a question many parents quietly carry.
“By three, shouldn’t a child be able to understand reason? Why is it still so hard?”
I smiled and said, “Have you heard of the troublesome twos and terrible threes?”
Many parents start feeling deeply frustrated when their child reaches two or three.
Brushing teeth becomes a negotiation.
Packing away toys requires repeated reminders.
Leaving the house turns into a battle.
Slowly, doubt creeps in:
Am I spoiling my child?
Am I not being firm enough?
Very often, the issue is not our parenting style.
It is our expectation of a young child’s developing brain.
Cooperation Is Still a Developing Ability
We often see “listening” as an attitude problem.
From a neuroscience perspective, however, cooperation is a skill.
The part of the brain responsible for self-control, impulse inhibition, rule understanding, and delayed gratification is the prefrontal cortex.
Research shows that around age three, the prefrontal cortex begins to play a more obvious role in behaviour regulation. Executive functions such as inhibitory control and working memory enter a period of rapid development.
But these abilities are still highly unstable, especially when a child is emotionally overwhelmed.
More importantly, the prefrontal cortex does not mature fully in early childhood. Brain imaging studies suggest that its development continues into late adolescence and even into the twenties, reaching fuller maturity around the mid-twenties.
In other words, a three-year-old’s brain is still under construction.
When we expect a three-year-old to reason calmly while emotionally activated, we are asking too much of a prefrontal cortex that is not yet mature.
When the Prefrontal Cortex Temporarily Goes Offline
Psychiatrist Dr Daniel Siegel uses a simple hand model to explain how the brain works.
When the thumb folds into the palm, it represents the lower brain — the limbic system, or emotional brain.
When the four fingers fold over the thumb, they represent the upper brain — the cortex, or thinking brain, including the prefrontal cortex.
The base of the palm represents the brainstem, or survival brain, which controls functions such as breathing and heartbeat.
For this discussion, we will focus mainly on the lower brain and upper brain.
When a child is emotionally regulated, the fingers cover the thumb. This represents the thinking brain helping to regulate the emotional brain.
But when a child has an emotional outburst, it is as if the fingers suddenly flip open. The prefrontal cortex temporarily loses its ability to integrate and regulate, and the emotional brain takes over.
This state is not intentional irrationality.
It is the thinking brain temporarily going offline.
In this state, more reasoning, more rules, and more criticism often cannot reach the child’s understanding system.
So when we see out-of-control behaviour, what is often underneath is an immature brain working very hard.
Is the Child Really Trying to Fight Against Us?
From a developmental perspective, most children are not naturally trying to oppose their parents.
Attachment theory tells us that children are born with an instinct to stay close and connected to their primary caregivers. This attachment system exists for safety and survival. Children are wired to preserve connection, not destroy it.
Self-determination theory also suggests that human beings have three core psychological needs:
- connection
- competence
- autonomy
When children feel safe and understood in a relationship, they are more likely to cooperate.
In other words, cooperation is not built through pressure.
It grows gradually from security.
Very often, children are not unwilling to listen.
They temporarily lack the regulation skills needed to do so.
Before Regulation, Instruction Often Does Not Work
When the nervous system is still highly activated, the thinking brain has not yet come back online.
At that point, instructions are unlikely to work.
Cooperation is something that becomes possible after regulation.
So instead of asking, “Why won’t he listen?”
we can begin by asking:
Does he have the capacity to regulate right now?
That shift in perspective is often the beginning of a different way of parenting.
Step-by-Step: How to Build Cooperation Without Adding More Pressure
1｜First, observe the child’s physical and emotional state
Tiredness, hunger, and overstimulation all reduce the functioning of the prefrontal cortex.
A child whose nervous system is close to collapse cannot easily move into cooperation.
Before giving more instructions, observe:
Is my child using the emotional brain right now, or the thinking brain?
2｜Use short, clear language
When emotions are high, simple and direct language is easier to process.
For example:
“Put the toys in the box.”
“Shoes on.”
This is not the time for long explanations or for joining the child’s emotional storm.
3｜Move closer and connect
Squat down to the child’s eye level.
Slow your voice.
Keep your tone steady.
If appropriate, use body language to show that your child is welcome to come close — for example, opening your arms.
A stable adult presence helps the child’s nervous system cool down. If the child allows physical contact, gentle touch may also help them settle.
Cooperation often comes from connection, not authority.
4｜Offer choices within clear boundaries
Once the child begins to settle, offer limited choices. This supports autonomy in two- and three-year-olds.
For example:
“Do you want to walk to the bathroom by yourself, or should I hold your hand?”
This kind of limited choice keeps the boundary clear while giving the child a sense of agency.
5｜Give warnings before transitions
Many conflicts happen because a child is suddenly interrupted.
Imagine you are reading an article or watching a video, and someone suddenly forces you to stop. You would probably feel irritated too.
Giving a warning before an activity ends helps the immature prefrontal cortex prepare for transition.
As I mentioned in a previous article, a tool such as the Time Timer can provide a visual reminder of time.
You can also give verbal warnings:
“We have five more minutes before we leave the park.”
Then at one minute:
“We have one more minute before we leave. What do you still want to play with? Go and enjoy it now.”
What I Am Learning at Home
I have also lost patience during busy moments. I have repeated instructions to my three-year-old daughter again and again, only to face more resistance.
Even though I am a therapist, I am not a perfect parent.
So I often remind myself:
Is she unwilling to do it — or is she temporarily unable to do it?
One day, when my three-year-old daughter had an emotional outburst, I almost corrected her immediately. Instead, I paused for a second, held her, and said softly, “You are very angry.”
A few minutes later, she went to pack away her toys by herself.
That moment reminded me:
When the thinking brain has flipped open, children do not need more instructions.
They need help to slowly integrate again.
I cannot always do this perfectly. But when I remember, “She is not being naughty — she is not ready yet,” I find more patience and more understanding.
In Closing
The “lack of cooperation” we see in two- and three-year-olds is often not an attitude problem.
It is a developmental stage.
The prefrontal cortex is still growing, while the emotional system is highly active. Children are not simply challenging us; they are learning how to regulate themselves.
Cooperation is not built through pressure.
It grows through repeated experiences of being understood and supported through regulation.
When we shift from:
“Why won’t he listen?”
to:
“Does he have the capacity to regulate right now?”
our parenting becomes both gentler and more effective.
And slowly, through being supported, the child learns to cooperate.
About the Author
Chloe Wong
Chloe Wong is an immigrant mother and speech pathologist based in Melbourne. She is the founder of Blackburn Speech & Paediatric Therapy, a bilingual multidisciplinary clinic supporting children and families from culturally and linguistically diverse backgrounds.
Having worked closely with immigrant families for many years, Chloe believes that while grandparents and parents may differ in approach, their intention is the same — to give the next generation a better life.
Through this column, she brings together research-informed insights and practical strategies to build bridges between generations, helping love translate into meaningful, effective support for children.
Follow her on Instagram: @phd.speechie.mum
