Autism in Toddlers: 15 Early Signs Parents Should Know

Noticing that a toddler communicates, plays or interacts differently from other children can leave parents with many questions.

Some children may use fewer gestures, respond differently to their names, show less interest in shared play or repeat certain movements and activities.

These differences can sometimes be early signs of autism spectrum disorder (ASD).

Autism is a neurodevelopmental condition associated with differences in social communication and interaction, as well as restricted or repetitive patterns of behavior, interests or activities.

It can become noticeable during the first few years of life, although every child’s developmental pattern is different.

Recognizing early developmental differences can help parents seek an appropriate assessment and access support when needed.

Early support can help children develop communication, movement, play and everyday living skills according to their individual needs.

This article explains the early signs of autism parents may notice in toddlers, how autism is assessed and how developmental therapies, including physiotherapy when appropriate, can support a child’s development.

What Is Autism Spectrum Disorder?

Autism spectrum disorder is a neurodevelopmental condition that affects how a person communicates, interacts socially and experiences the world.

The term spectrum reflects the wide range of ways autism can affect children.

Some toddlers may need considerable support with communication and daily activities, while others may have more subtle differences that become clearer as social and learning demands increase.

Autistic children have different strengths, preferences and support needs. Some may have strong visual memory, attention to detail or an intense interest in particular activities.

Others may need additional support with communication, sensory experiences and everyday routines.

Autism is not caused by poor parenting, and it is not something a child catches from another person. Research suggests that genetic and other biological factors contribute to its development.

Autism is a lifelong neurodevelopmental condition, but a child’s abilities, support needs and ways of communicating can develop and change over time.

When Do Early Signs of Autism Usually Appear?

Some developmental differences associated with autism may become noticeable during the first 12 to 24 months of life.

Certain signs can appear earlier, while others become more apparent as a child’s communication and social demands increase.

Parents may initially notice differences in:

• Response to their name
• Eye contact and shared attention
• Pointing, waving and other gestures
• Babbling and early language
• Interest in social games
• Repetitive movements or play
• Responses to sounds, textures and changes in routine

Some children show developmental differences gradually. Others develop certain skills and later lose previously acquired abilities.

Any loss of previously acquired language, social or other developmental skills should be discussed promptly with a healthcare professional.

One developmental difference does not confirm autism. Children develop at different rates, and other conditions can also affect communication and behavior.

Early Signs of Autism in Toddlers Parents May Notice

Autism can present differently in every child.

The following signs can help parents understand possible developmental differences, but they should not be used as a home diagnostic checklist.

1. Limited Response to Their Name

A toddler may not consistently turn or look when their name is called, even in a familiar environment.

This may be noticeable when the child is engaged in an activity or when someone tries to get their attention.

However, inconsistent responses can also occur with hearing difficulties or attention differences. A hearing assessment may be recommended when a child does not respond consistently to sounds or speech.

2. Differences in Eye Contact and Social Interaction

Some autistic toddlers may use eye contact differently or less frequently during social interactions.

They may be less likely to look towards another person when sharing an experience, playing a game or communicating a need.

Eye contact varies naturally between children. Limited eye contact alone is not sufficient to identify autism.

3. Limited Pointing or Gesturing

Gestures help toddlers communicate before they develop a larger spoken vocabulary.

Parents may notice that a child:

• Rarely points to show something interesting.
• Does not consistently wave goodbye.
• Uses fewer gestures to communicate needs.
• Does not often bring objects to show another person.

An important developmental skill is joint attention. This means sharing attention with another person towards an object or event.

For example, a toddler may point towards an aero plane and look back at a parent to share the experience.

Differences in joint attention can be an important early developmental sign.

4. Delayed Speech or Communication Differences

Some toddlers with autism develop spoken language later than expected. Others may use words but have difficulty using them in social communication.

Parents may notice:

• Limited babbling or spoken words.
• Difficulty using words to request or share interests.
• Repeating words or phrases.
• Limited back-and-forth communication.
• Difficulty following simple spoken instructions.

Not all autistic children have delayed speech. Some develop language early but experience differences in conversational communication and social language.

5. Different Patterns of Play

As toddlers grow, they often begin copying everyday activities during play.

For example, they may pretend to feed a doll, talk on a toy telephone or make a toy car drive.

Some autistic children may show less spontaneous pretend play or prefer arranging, sorting or exploring toys in repetitive ways.

Their play interests may differ, but this does not mean they cannot enjoy imaginative activities.

6. Repetitive Movements or Behaviors

Some toddlers repeat particular movements or actions, especially when excited, overwhelmed or regulating sensory experiences.

Examples include:

• Hand flapping
• Rocking the body
• Spinning objects
• Repeatedly opening and closing doors
• Lining up toys
• Repeating the same play sequence

These behaviors may provide enjoyment, help with self-regulation or reflect a preference for predictable activities.

7. Strong Preference for Routines

Some autistic toddlers prefer predictable routines and may become distressed when familiar activities change unexpectedly.

Parents may notice difficulty with transitions such as stopping a favorite activity, changing the usual route, trying unfamiliar foods or moving between playtime and bedtime.

Predictable routines and preparation for transitions may help children feel more comfortable.

8. Different Responses to Sensory Experiences

Sensory differences are common among autistic children, although they vary from child to child.

Some toddlers may be particularly sensitive to:

• Loud or sudden noises
• Bright lights
• Certain clothing materials
• Hair washing or brushing
• Food textures
• Crowded environments

Other children may seek additional sensory input by spinning, touching objects repeatedly, jumping or watching moving objects closely.

These responses may reflect differences in how the child processes sensory information.

9. Differences in Social Play

Some toddlers may show less interest in interacting with other children or may prefer independent play.

They may find shared games, turn-taking or social imitation challenging.

However, playing alongside other children without directly interacting is common during toddlerhood. Social development should always be considered in relation to the child’s age and overall developmental pattern. (CDC, 2024)

Developmental Milestones Parents Can Observe

Developmental milestones provide a general guide to skills many children develop at particular ages. They are not diagnostic criteria for autism.

Age	Examples of developmental skills
12 months	Plays simple social games, such as pat-a-cake, and uses gestures such as waving
15 months	Points to request something or get help and looks at familiar objects when named
18 months	Points to show something interesting and tries to say several words
24 months	Uses two-word phrases and notices when another person is upset

Children do not all develop at exactly the same pace. Milestones describe skills achieved by most children at a particular age, not a strict deadline for every child.

Parents who notice missing milestones or differences in communication, play or interaction should discuss them with a healthcare professional. (CDC, 2026)

What Is the Difference Between Autism and Speech Delay?

Speech delay and autism can sometimes appear similar during early childhood, particularly when a toddler uses few spoken words.

However, they are not the same condition.

Speech delay	Autism
Primarily involves delayed development of spoken language	Involves differences in social communication and restricted or repetitive behaviors
Gestures and shared attention may develop as expected	Differences in gestures or joint attention may also be present
Social interaction may be typical for the child’s developmental stage	Social communication may develop differently
Does not automatically indicate autism	Requires a broader developmental assessment

Some autistic children also have speech or language delays. Others may develop spoken language at an expected pace but experience differences in social communication.

A speech and language assessment can help identify communication needs, but it cannot independently confirm or rule out autism.

Can Autism Be Mistaken for Hearing or Developmental Difficulties?

Yes. Some early signs associated with autism can also occur in children with other developmental or health conditions.

For example:

• Hearing difficulties may affect responses to names and spoken instructions.
• Speech and language disorders may affect communication.
• Global developmental delay may affect several areas of development.
• Differences in attention may affect how a child responds during interactions.

This is why a proper assessment matters. A healthcare professional may recommend hearing tests, developmental assessments or other investigations to understand the child’s needs.

How Is Autism Diagnosed in Toddlers?

There is no single blood test or brain scan that can diagnose autism.

Diagnosis is based on a detailed assessment of the child’s development, behavior and communication.

Developmental History

Parents may be asked about the child’s early development, including speech, gestures, play, social interaction and sensory responses.

Information about when particular skills appeared and whether any skills were lost is especially important.

Observation of Behaviour

A trained professional may observe how the child communicates, responds to others, plays and interacts in different situations.

Developmental Screening

Standardized screening tools help identify children who may need further evaluation.

One commonly used tool is the Modified Checklist for Autism in Toddlers, Revised with Follow-Up (M-CHAT-R/F), designed for children aged 16 to 30 months.

A screening result is not a diagnosis. A positive screening result means that further assessment may be appropriate.

Hearing and Developmental Assessment

Hearing difficulties can affect speech and communication development. A hearing assessment may therefore be recommended.

Professionals may also assess language, cognitive development, motor skills and everyday functioning to understand the child’s overall needs.

Multidisciplinary Evaluation

Depending on the child and healthcare system, assessment may involve a developmental pediatrician, child psychologist, speech and language therapist, occupational therapist or other trained professionals.

The aim is to understand the child’s developmental profile and identify suitable support.

When Should Toddlers Be Screened for Autism?

The American Academy of Pediatrics recommends general developmental screening at 9, 18 and 30 months, and autism-specific screening at 18 and 24 months.

These routine screening appointments help identify developmental concerns early. However, parents should not wait until these ages if they have concerns about their child’s development.

A screening tool identifies children who may need further assessment. It does not provide a definitive diagnosis.

In India, a 2024 study evaluated Hindi versions of three autism-specific screening tools, including M-CHAT-R/F, in children aged 16 to 30 months.

The researchers reported acceptable screening accuracy and reliability in the study population.

This is relevant for Indian families because language and cultural adaptation can influence how screening questions are understood.

However, the findings do not mean that a translated questionnaire can replace a comprehensive clinical assessment. (Mukherjee et al., 2024)

Why Is Early Identification Important?

Early identification helps parents understand their child’s developmental needs and access appropriate support.

It can help address difficulties related to:

• Communication and language
• Social interaction and play
• Sensory experiences
• Movement and coordination
• Daily activities and independence

The goal of early support is not to make an autistic child behave like every other child. It is to support communication, comfort, participation and independence.

The American Academy of Pediatrics also recommends that developmental intervention should not be unnecessarily delayed while a child waits for a formal autism diagnosis.

Support can begin when a developmental need is identified. (Hyman et al., 2020)

How Can Therapy Help Toddlers With Autism?

There is no single therapy suitable for every autistic child. Support should be based on the child’s strengths, developmental profile and individual needs.

A coordinated approach may involve speech and language therapy, occupational therapy and physiotherapy when indicated.

1. Speech and Language Therapy

Speech and language therapy supports communication development.

A therapist may work on:

• Understanding simple instructions.
• Developing gestures and communication skills.
• Expressing needs and preferences.
• Building spoken language where appropriate.
• Supporting alternative communication methods, including picture-based systems or communication devices.
• Developing social communication through meaningful interactions.

Communication support is valuable even when a child is not yet using spoken words.

2. Occupational Therapy

Occupational therapy can help children participate in everyday activities.

Depending on the child’s needs, support may include:

• Sensory regulation strategies.
• Playing and exploring different activities.
• Feeding and dressing skills.
• Hand coordination and fine motor development.
• Adapting everyday environments to reduce unnecessary sensory distress.

Interventions should be selected according to the child’s individual functional needs.

3. Physiotherapy for Toddlers With Autism

Physiotherapy is not required by every autistic child. It may be helpful when a toddler also experiences difficulties with gross motor development, posture, balance, coordination or functional movement.

A pediatric physiotherapist may assess the child’s movement abilities and identify areas where additional support could improve everyday participation.

Gross Motor Development

Some children may experience delays in skills such as sitting, crawling, standing, walking, jumping or climbing.

Physiotherapy can support age-appropriate movement development when these difficulties are present.

Balance and Coordination

Play-based activities may help improve balance, body awareness and coordination during everyday movement.

Muscle Strength and Postural Control

Individualised exercises and movement activities may help develop strength, stability and postural control.

Walking and Functional Mobility

A physiotherapist may assess walking patterns, movement efficiency and difficulties with stairs or playground activities.

Motor Planning and Movement Skills

Some children may find it difficult to plan and perform movements in sequence. A physiotherapist can use simple, structured activities to practice functional movements at an appropriate level.

Participation Through Play

Movement-based play provides opportunities to practise motor skills, explore different movements and participate more confidently in daily activities.

A 2025 systematic review examined 57 studies involving 1,622 children with autism, aged 3 to 17 years. It found that motor skill and physical activity interventions showed positive effects on motor development.

However, the overall quality of the included evidence was low, and the findings should not be directly assumed to apply to every toddler. (Xing and Wu, 2025)

Physiotherapy should be based on a functional assessment rather than the autism diagnosis alone. Rehabilitation should also respect the child’s sensory preferences, communication style and comfort.

What Can Parents Do at Home to Support Development?

Parents and caregivers play an important role in supporting a toddler’s communication, play and movement.

Simple everyday activities can create opportunities for learning without putting pressure on the child.

• Follow the child’s interests: Join activities the child already enjoys and gradually introduce shared play.
• Use simple communication: Combine short phrases with gestures, pictures or visual cues when helpful.
• Encourage movement-based play: Provide safe opportunities for walking, climbing, rolling a ball and exploring age-appropriate movement.
• Prepare for transitions: Use predictable routines and give the child time to adjust when activities change.
• Respect sensory preferences: Avoid forcing a child into uncomfortable sounds, textures or environments.
• Celebrate communication attempts: Respond positively to gestures, sounds, words and other ways the child expresses needs.

These activities support development but should not replace professional assessment or individualized intervention when needed.

When Should Parents Seek an Autism Assessment?

Parents should discuss developmental concerns with a healthcare professional rather than waiting for the child to grow out of them.

Consider seeking an assessment if a toddler:

• Rarely responds to their name.
• Uses very few gestures to communicate.
• Does not consistently point to share interest.
• Has limited back-and-forth interaction.
• Shows repetitive behaviours alongside social communication differences.
• Has difficulty with age-appropriate communication or play.
• Loses words or other previously acquired skills.

A child who loses previously acquired language, social or motor skills should receive prompt developmental and medical assessment.

Parents do not need to wait until all possible signs are present before asking for help.

What Should Parents Do After an Autism Diagnosis?

Receiving an autism diagnosis can bring many emotions and questions. Parents may feel uncertain about what to do next.

A practical starting point is to understand the child’s individual strengths and support needs.

1. Discuss the assessment: Ask the healthcare professional to explain the findings and recommended next steps.
2. Support communication: Use simple language, gestures, visual supports or other communication methods that work for the child.
3. Create predictable routines: Prepare the child for transitions and changes where possible.
4. Encourage play: Follow the child’s interests and create opportunities for enjoyable shared activities.
5. Access appropriate therapies: Seek support based on communication, sensory, motor and daily-living needs.
6. Coordinate with childcare providers: Share practical strategies that help the child participate comfortably.

Parents should also ask about available developmental services and support programmes in their area.

Conclusion

Autism in toddlers can become noticeable through differences in communication, social interaction, play, sensory responses and behavior.

Some children show several early signs, while others display only a few developmental differences during their first years.

Recognizing these patterns does not mean diagnosing a child at home. It means knowing when to discuss developmental concerns with a qualified professional.

Early identification can help families access appropriate developmental support.

Speech and language therapy, occupational therapy and physiotherapy, when indicated, can address individual communication, sensory and movement needs.

Every autistic child has a different developmental profile.

With understanding, appropriate support and a child-centered approach, families can help toddlers build skills, confidence and greater participation in everyday life.

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