As this is the final article in my series on recognising autism in young children, I wanted to focus on the age where many families first begin seeking answers.

Between the ages of three and four, developmental differences often become much easier to recognise.

Children are beginning to hold conversations, play imaginatively, build friendships and become more independent. When your child develops differently from their peers, those differences can suddenly become much more noticeable.

That was certainly true for us.

If your child is younger, check out my post on common signs of autism in children aged 18-30 months here and for signs of autism in infants 0-18 months, read this post.

By this stage, many of the behaviours I’d noticed during my child’s first few years were becoming more obvious. Some had become stronger, while others had changed as my child learned new ways to cope with the world around them.

Looking back now, I can clearly see how these small observations gradually formed a much bigger picture.

This article isn’t a medical checklist.

It’s a collection of the behaviours I personally noticed in my autistic child between the ages of 30 and 48 months, together with my own reflections as an autistic adult.

If you’ve found your way here because you’re wondering whether your toddler’s development is typical, I hope our family’s story helps you feel a little less alone.

Before You Read

Every autistic child is different.

Some children will show many of the behaviours in this article, while others may only show a handful.

Likewise, many neurotypical toddlers occasionally display one or two of these behaviours as part of normal development.

That’s why no single behaviour can diagnose autism.

It’s the overall pattern of development that matters.

This article is based on my personal experiences, not intended as a diagnostic guide. If you’re worried about your child’s development, speak to your GP, health visitor or paediatrician, who can advise whether further assessment would be helpful.

 

What Changed Between Three and Four Years Old?

When my child was younger, many differences could easily be explained away.

“They’ll talk when they’re ready.”

“They’re just shy.”

“They’ll grow out of it.”

I’d heard every one of those comments.

But by the time my child reached three years old, I started noticing that other children were developing social skills, communication and independence much faster.

It wasn’t one big moment that made me realise something was different.

It was dozens of tiny moments that slowly added together.

As an autistic adult, I now recognise many of those same differences in myself growing up.

That perspective has helped me understand my child with far more compassion than I probably could have otherwise.

    1. Eye Contact Still Didn’t Feel Natural

Eye contact continued to be one of the clearest differences I noticed.

My child could happily look almost anywhere except directly into another person’s eyes.

If I gently encouraged eye contact, they often became visibly uncomfortable and immediately looked away.

As they got older, this sometimes created confusion with other children.

Because they weren’t looking directly at the person they were speaking to, classmates occasionally thought they weren’t listening.

Eventually, we found something that worked.

Instead of asking my child to make direct eye contact, I encouraged them to look at the bridge of someone’s nose or between their eyes instead.

It achieved the same social effect while feeling much less overwhelming for them.

That small adjustment made conversations far less stressful.

One thing I’ve learned as an autistic adult is that eye contact isn’t simply about confidence.

For many autistic people, it can genuinely feel intense or uncomfortable.

Helping children find alternatives rather than forcing direct eye contact can often reduce anxiety while still supporting communication.

    2. Speech Was Still Developing More Slowly

Although my child’s communication had improved since toddlerhood, speech was still developing differently from many children of the same age.

Conversations were often shorter.

Expressing wants and needs remained difficult.

Sometimes they became frustrated because they knew exactly what they wanted but couldn’t find the words quickly enough.

Before pursuing an autism assessment, our paediatrician recommended a hearing test to rule out hearing loss.

I’m really glad we did.

It’s an important reminder that speech delays can have many different causes, and hearing should always be considered first.

Once hearing difficulties had been ruled out, we continued documenting everything we were noticing before returning to discuss our concerns.

Looking back, keeping written notes made those appointments much easier because I wasn’t trying to remember months of observations from memory.

It also helped us see patterns we may otherwise have missed.

   

3. Understanding Social Situations Was Difficult

As other children became more socially aware, the gap between my child and their peers became easier to notice.

Many children around this age naturally begin recognising emotions in others.

They understand when someone is happy, upset or excited.

They begin following simple social rules and learning how conversations work.

My child found those things much harder.

Understanding facial expressions didn’t come naturally.

Knowing what another person might be thinking or feeling was often confusing.

As an autistic adult, this is something I’ve had to learn consciously throughout my life.

Many social situations that seem instinctive to other people have always felt more like learning a second language.

That doesn’t mean autistic children lack empathy.

Sometimes they simply need more explicit support to understand social cues that other children absorb naturally.

   

4. Preferring to Play Alone

This was one of the behaviours other adults noticed before I did.

At nursery and in the playground, my child usually chose solitary activities rather than joining group games.

They often watched other children with interest but rarely joined in.

I also noticed they didn’t naturally copy what other children were doing.

Many preschoolers learn through imitation.

They copy dances.

Games.

Funny faces.

Pretend play.

My child preferred discovering things independently instead.

That wasn’t because they disliked other children.

They simply seemed happier exploring the world in their own way.

Looking back, I realise I was exactly the same.

Even now, I often enjoy being around people without necessarily wanting to participate in everything they’re doing.

    5. Choosing Older Children as Friends

One thing that surprised me was that my child often seemed more comfortable around children who were slightly older.

Not years older.

Just enough that their communication was clearer and more predictable.

I’ve often wondered whether this made social situations easier.

Older children tended to explain games more clearly.

Their facial expressions and intentions were often easier to understand.

There was less guessing involved.

Of course, this was simply our experience.

Every autistic child develops friendships differently.

But it’s something I noticed often enough that it really stood out to me.

     

6. Fine Motor Skills Took Longer to Develop

Tasks requiring coordination continued to be challenging.

Using scissors.

Holding pencils correctly.

Building with small blocks.

Completing puzzles.

Getting dressed independently.

Many of these skills eventually came, but they took considerably longer than I’d expected.

Motor skill differences don’t automatically indicate autism.

However, alongside the other developmental differences we were seeing, they became another important piece of the overall picture.

Looking back now, I wish I’d celebrated each small achievement instead of comparing the timeline to other children.

Progress is still progress, even when it happens more slowly.

    7. Sensory Sensitivities Became More Noticeable

By the time my child reached three years old, it became much clearer that they experienced the world differently.

Places that seemed perfectly ordinary to most families could quickly become overwhelming.

A busy supermarket.

A birthday party.

The school playground.

Even a trip to the cinema.

What looked like an exciting day out often became too much because of the constant noise, bright lights, unfamiliar smells and unpredictable movement.

I used to think my child was simply becoming overwhelmed more easily than other children.

Now I understand it differently.

Many autistic people process sensory information more intensely, meaning everyday environments can feel exhausting rather than enjoyable.

As an autistic adult, I still experience this myself.

If there’s too much noise around me, I struggle to concentrate on conversations because my brain seems to process every sound at the same volume.

Learning this changed the way we approached family outings.

Instead of expecting my child to tolerate overwhelming environments, I started planning quieter visits, carrying sensory aids and allowing time for breaks whenever they needed them.

That simple change made outings much more enjoyable for all of us.

    8. They Played Differently from Other Children

As imaginative play became more common among other preschoolers, I noticed my child’s play still looked quite different.

While other children pretended to run cafés, play teachers or look after dolls, my child often became fascinated by one specific part of a toy.

They loved spinning wheels.

Watching lights flash.

Lining up figures.

Turning objects over to study how they worked.

It wasn’t that they lacked imagination.

They were simply interested in different things.

As an autistic adult, I completely understand that curiosity.

Even now, I often become deeply absorbed in the details of something that other people barely notice.

Looking back, I wish I’d worried less about whether my child’s play looked “typical” and spent more time appreciating how beautifully curious they were.

Children don’t all learn in the same way.

Autistic children often explore the world through patterns, movement and sensory experiences that others may overlook

    9. Changes to Routine Could Be Extremely Upsetting

By this age, routines had become a huge part of our daily lives.

If we took a different route home…

Changed bedtime slightly…

Or even served food on the wrong plate…

My child often became extremely distressed.

At the time, I couldn’t understand why such small changes felt so significant.

As an autistic adult, I now recognise that familiar routines create predictability.

When the world already feels busy, noisy and unpredictable, knowing exactly what’s going to happen next can be incredibly reassuring.

That doesn’t mean autistic children can’t cope with change.

Many can.

But unexpected change often requires more preparation and reassurance.

Once I started giving advance warning whenever plans changed, I noticed my child coped much better.

Sometimes something as simple as saying,

“We’re going to do things a little differently today,”

was enough to reduce anxiety.

That small adjustment transformed many of our daily routines.

    10. Sleep Continued to Be a Challenge

By preschool age, I hoped sleep would have become easier.

It hadn’t.

Falling asleep still took a long time.

Night waking was common.

Some evenings my child seemed physically exhausted but mentally wide awake.

As someone who’s autistic, this felt incredibly familiar.

Even now, I often struggle to quiet my thoughts at bedtime.

It’s as though my brain continues processing everything that happened during the day long after my body is ready for sleep.

Eventually we discovered that consistency helped more than anything else.

The same bedtime.

The same order.

The same calming activities.

We avoided screens before bed, kept lighting low and created a predictable bedtime routine that rarely changed.

It didn’t solve every sleep problem overnight.

But it made bedtime feel much calmer, both for my child and for us as parents.

Looking back, I realised I wasn’t just creating a bedtime routine.

I was creating a sense of safety.

     11. Big Emotions Were Difficult to Communicate

One thing I wish I’d understood earlier was that behaviour is often communication.

When my child became overwhelmed, it sometimes looked like anger.

Other times it looked like shutting down completely.

Occasionally there were meltdowns that seemed to happen without warning.

Now I know there was always a reason.

Sometimes it was sensory overload.

Sometimes frustration.

Sometimes anxiety.

Sometimes simply being mentally exhausted after trying to cope all day.

As an autistic adult, I recognise those feelings.

There are still moments when I become overwhelmed and struggle to explain what’s wrong.

That shared experience helped me stop asking,

“What’s wrong with my child?”

and start asking,

“What is my child trying to tell me?”

That single question changed the way I parented.

Instead of focusing on the behaviour itself, I began looking for the reason behind it.

Very often, the behaviour started to make perfect sense..

    12. Affection Was Shown in Their Own Way

One of the biggest myths about autism is that autistic children aren’t affectionate.

That simply wasn’t true for our family.

My child loved deeply.

They just showed it differently.

Rather than running over for spontaneous hugs, they’d quietly sit beside me while I worked.

Sometimes they’d bring me a favourite toy.

Other times they’d simply want to be in the same room.

As they got older, I realised those quiet moments were their way of saying,

“I feel safe with you.”

As an autistic adult, I understand that perfectly.

Affection doesn’t always have to be loud or obvious.

Sometimes trust is shown through presence rather than physical touch.

Once I recognised my child’s own way of expressing love, I stopped comparing it with other families.

I simply appreciated it for what it was.

    13. Special Interests Became Much Stronger

Around this age, my child’s favourite interests became much more intense.

When they discovered something they loved, they wanted to learn everything about it.

Books.

Videos.

Conversations.

Toys.

Everything revolved around that one subject.

To someone unfamiliar with autism, it might have looked obsessive.

I saw something different.

I saw genuine passion.

As an autistic adult, I know exactly how absorbing special interests can be.

They’ve helped me learn new skills, build confidence and find enormous enjoyment throughout my life.

Rather than trying to limit those interests, we started using them to encourage learning.

Reading became easier when books included favourite topics.

Counting became more enjoyable when favourite toys were involved.

Those interests became bridges to learning rather than barriers.

Looking back, embracing them was one of the best parenting decisions we made.

  14. Making Friends Was More Difficult

As my child grew older, friendships became more important to the children around them.

Many of their peers were beginning to form close friendships, invite one another to birthday parties and enjoy playing together for long periods.

My child wanted company, but social interaction often looked different.

Sometimes they preferred to play alongside other children rather than with them.

Other times they were happiest talking about their favourite interests instead of joining group games.

As an autistic adult, I completely understand that feeling.

Growing up, I always wanted friends, but I often struggled to understand the unwritten social rules that everyone else seemed to know instinctively.

Looking back, I wish I’d realised sooner that friendships don’t have to look the same for every child.

Some autistic children have one close friend.

Others enjoy spending time with adults or older children.

Some prefer smaller groups or quieter environments.

None of those experiences are wrong.

What’s most important is that children feel accepted for who they are, rather than pressured to socialise in ways that don’t feel natural to them.

    15. Food Preferences Became Increasingly Limited

Mealtimes continued to be one of the biggest challenges in our home.

By this stage, my child had developed a very small list of foods they felt comfortable eating.

If a favourite brand changed its packaging…

If a meal looked slightly different…

Or if two foods touched on the plate…

That was often enough for the entire meal to be rejected.

Before I understood autism, I worried that I was somehow encouraging picky eating.

Now I know it wasn’t about being fussy.

For many autistic children, food is a sensory experience.

Texture.

Temperature.

Smell.

Colour.

Even tiny changes can completely alter how a food feels.

Once I stopped trying to make every meal a battle and focused on gradually expanding my child’s accepted foods, life became much less stressful.

Progress happened slowly.

Sometimes painfully slowly.

But it happened.

If you’re experiencing the same struggles, please know you’re not alone.

So many parents of autistic children face exactly the same challenges.

    16. Repetitive Movements Helped with Self-Regulation

Around this age, repetitive movements became easier to recognise.

My child often rocked, flapped their hands when excited or repeated certain movements during times of stress.

When I first noticed these behaviours, I wondered whether I should discourage them.

I’m so glad I didn’t.

As I’ve learned more about autism and reflected on my own experiences. I now understand that these movements, often called stimming, can play an important role in emotional and sensory regulation.

I had my own stims as a child and every time I did it, I would get punched for it. I was told that this was the only way to help me get rid of ‘doing weird things’.

To be honest, being told not to stim made me do it more, because doing it caused me stress and thinking about not doing it caused me stress and worrying about not doing it caused me even more stress. Which made me stim much more!

As a now autistic adult, I still find myself tapping my fingers, gently rocking or fidgeting when I’m concentrating.

It’s not something I consciously choose to do.

It simply helps my brain process what’s happening around me.

Once I understood that, I stopped seeing these movements as behaviours that needed correcting.

Instead, I recognised them as healthy coping strategies that helped my child feel calmer and more comfortable.

    17. Toilet Training Happened in Its Own Time

Toilet training was another milestone that took much longer than I’d expected.

There were moments when I worried we’d never get there.

Some days everything seemed to be going well.

Then suddenly we’d feel as though we were starting all over again.

As difficult as it was, I eventually realised that comparing my child to other children only added unnecessary pressure.

Autistic children often learn new skills in their own time.

That doesn’t mean they won’t get there.

It simply means the journey may look different.

For us, consistency, patience and celebrating every small success made far more difference than trying to rush the process.

Looking back, I wish I’d been kinder to myself.

Progress isn’t always measured by how quickly something happens.

Sometimes it’s measured by refusing to give up.

   18. Lining Up Objects

If it is the same or looks the same or is the same size.  

Ladies and Gents. My kid WILL line it up.

If only my kid was this enthusiastic about the laundry.

    19. Understanding Other People’s Emotions Wasn’t Always Easy

As conversations became more complex, I noticed my child sometimes found it difficult to understand what other people were feeling.

If someone was upset, they didn’t always recognise the facial expressions or body language that seemed obvious to others.

That didn’t mean they lacked compassion.

Far from it.

Once someone explained how another person was feeling, my child often showed enormous kindness and concern.

As an autistic adult, this really resonates with me.

I’ve spent much of my life consciously learning social cues that many people seem to understand automatically.

It’s not that I don’t care about other people’s feelings.

Sometimes I simply need those feelings to be communicated more directly.

Understanding this helped me become much more patient as a parent.

Instead of assuming my child didn’t care, I realised they sometimes needed a little more support interpreting situations that other children found easier.

    20. They Preferred Predictability

One thing remained consistent throughout my child’s early years.

Predictability mattered.

Knowing what was happening next reduced anxiety.

Unexpected changes could quickly make an otherwise enjoyable day feel overwhelming.

Simple things helped enormously.

Talking through plans before leaving the house.

Using visual routines.

Giving plenty of warning before changing activities.

Explaining what would happen next.

As an autistic adult, I still rely on many of those same strategies today.

Predictability doesn’t remove life’s challenges.

But it makes them feel much more manageable.

Looking back, I realise we weren’t creating rigid routines.

We were creating a sense of security.

    21. They Noticed Details Everyone Else Missed

One of my favourite things about my child has always been their ability to notice tiny details.

They’d spot insects hidden in the grass.

Notice changes in road signs I’d walked past for years.

Remember conversations from months earlier that everyone else had forgotten.

Their attention to detail constantly amazed me.

As an autistic adult, I experience something very similar.

It’s one of the strengths autism has given me.

While autism often comes with challenges, it can also bring incredible abilities that deserve to be recognised and celebrated.

    22. They Thrived with Clear Expectations

One lesson I learned very quickly was that vague instructions rarely worked.

Instead of saying,

“Go and get ready.”

I’d break tasks into smaller steps.

“Put your shoes on.”

“Now get your coat.”

“Now wait by the front door.”

Almost immediately, everything became easier.

That experience taught me something valuable.

Sometimes children don’t need more discipline.

They simply need clearer communication..

    23. Trusting My Instincts Was the Best Decision I Made

For a long time, I questioned myself.

Family members reassured me.

Friends told me not to worry.

People said my child would grow out of it.

Part of me wanted to believe them.

But another part of me knew something felt different.

Looking back, I’m incredibly grateful that I trusted those instincts.

Seeking professional advice didn’t change who my child was.

It simply helped us understand them better and access support that made everyday life easier.

As parents, we know our children better than anyone else.

If something doesn’t feel right, it’s okay to ask questions.

My Child Didn’t Need Fixing. They Needed Understanding

This is probably the most important lesson autism has taught me.

For a long time, I thought my role as a parent was to help my child become more like everyone else.

Now I see things very differently.

My child was never broken.

They didn’t need fixing.

They needed understanding.

They needed patience.

They needed acceptance.

Most importantly, they needed people who recognised both their challenges and their incredible strengths.

Being autistic myself has helped me understand that difference in a way I couldn’t have years ago.

Autism isn’t simply a list of difficulties.

It’s a different way of experiencing the world.

And once I stopped trying to change my child, I became a much better parent.

When Should You Seek Professional Advice?

If you’ve recognised several of the behaviours I’ve described, try not to panic.

Many children show individual traits at different stages of development, and no single behaviour means a child is autistic.

What matters is the overall pattern over time.

If you’re concerned, start keeping notes.

Write down the behaviours you’ve noticed, when they happen and how often they occur.

Those observations can be incredibly helpful when speaking with your GP, health visitor or paediatrician.

Seeking an assessment isn’t about putting a label on your child.

It’s about understanding their needs and making sure they receive the right support if they need it.

Final Thoughts

Looking back across my child’s early years, I can see that autism wasn’t revealed by one dramatic moment.

It was a series of small observations that gradually formed a bigger picture.

Some behaviours became more obvious with age.

Others changed as my child developed new skills and ways of navigating the world.

Every step of the journey taught me something—not only about autism, but about patience, acceptance and seeing the world through someone else’s eyes.

As both an autistic adult and the mother of an autistic child, I’ve learned that there isn’t one “right” way to communicate, play, learn or experience life.

Every autistic person is unique.

If you’re reading this because you’re worried about your own child, I hope our family’s story has reassured you that you’re not alone.

Whether your child is autistic or simply developing in their own unique way, they deserve to be understood, supported and celebrated for who they are.

And if there’s one piece of advice I’d leave you with, it’s this:

Trust your instincts.

You know your child better than anyone else.

Frequently Asked Questions

What are the common signs of autism in a toddler aged 3 to 4?

Some common signs include differences in communication, social interaction, imaginative play, sensory processing, repetitive behaviours, strong routines and intense interests. Every autistic child is different, so no two children will show exactly the same combination of traits.

Can autism become more noticeable as a child gets older?

Yes. As children grow, social expectations increase, which can make developmental differences more noticeable. Many families find that signs become easier to recognise between the ages of 3 and 4.

Do autistic toddlers enjoy playing with other children?

Some do, while others prefer solitary play, parallel play or spending time with adults or older children. Every autistic child has their own personality and social preferences.

Is picky eating a sign of autism?

Food selectivity can be common in autistic children, particularly when linked to sensory sensitivities around texture, smell, taste or appearance. However, picky eating on its own doesn’t mean a child is autistic.

Should I ask for an autism assessment if I’m concerned?

If you’ve noticed a pattern of developmental differences and you’re worried, it’s worth discussing your concerns with your GP, health visitor or paediatrician. Early advice can help you better understand your child’s needs and access support if it’s appropriate.