7 Common Early Signs of Autism in Infants and Toddlers
There is a particular kind of worry that settles in quietly. It is not dramatic. It does not arrive all at once. It is the kind that builds slowly, in the small moments. The way your baby does not turn toward your voice. The way your toddler lines up toys instead of playing with them. The way certain sounds send them into a spiral that takes a long time to come back from.
Most parents who end up on this page are not panicking. They are paying attention. And paying attention early is one of the most powerful things a parent can do.
Autism can be identified as early as 18 months in some children, and in many cases, signs are present even earlier than that. The earlier a child receives the right support, the better the outcomes tend to be. Not because autism needs to be fixed, but because understanding how your child experiences the world means you can build an environment that actually works for them.
This post walks through seven of the most common early signs of autism in infants and toddlers. It is not a diagnostic tool. Only a qualified professional can diagnose autism. But it is a starting point for parents who want to understand what they are seeing and what to do next.
Table of Contents
What Are Some Common Early Signs of Autism in Infants and Toddlers?
Sign 1: Limited or No Eye Contact
Sign 2: Not Responding to Their Name
Sign 3: Delayed or Absent Speech and Language
Sign 4: Repetitive Movements or Behaviours
Sign 5: Difficulty With Changes in Routine
Sign 6: Unusual Sensory Responses
Sign 7: Limited Interest in Other Children or Social Play
What to Do If You Recognize These Signs
Helpful Resources to Bookmark
Final Thoughts
What Are Some Common Early Signs of Autism in Infants and Toddlers?
This is one of the most searched questions by parents who are beginning to notice something different about their child's development. And it is the right question to be asking.
According to the World Health Organization, in 2021 about 1 in 127 persons had autism, making it one of the most common neurodevelopmental conditions in the world. Yet many children are still not diagnosed until school age or later, often because the early signs were not recognised or were dismissed by well-meaning professionals.
The signs listed below are not a checklist where ticking three boxes means your child is autistic. They are patterns worth paying attention to, patterns that, if present consistently and across different settings, are worth discussing with your child's paediatrician.
Sign 1: Limited or No Eye Contact
Eye contact is one of the earliest forms of human connection. Most babies begin making meaningful eye contact from around six to eight weeks old. By three months, a baby will typically hold your gaze, smile back, and track your face as you move.
In many autistic infants and toddlers, eye contact is limited, inconsistent, or absent entirely. This does not mean the child is unaware of the people around them. Many autistic children are deeply attuned to their environment. But the natural pull toward a caregiver's eyes that most neurotypical babies show may not be there in the same way.
What to look for:
Baby rarely looks at your face during feeding or play
Toddler looks past you or through you rather than at you during conversation
Eye contact happens only briefly or seems to take effort
Child does not look toward where you are pointing
It is worth noting that some autistic children make plenty of eye contact. The absence of eye contact alone does not confirm autism. But combined with other signs, it is something to bring up with a professional.
Sign 2: Not Responding to Their Name
According to the Center for Disease Control and Prevention, by around nine months, most babies will reliably turn toward the sound of their own name. It is one of the earliest markers of social awareness and language development.
A common early sign of autism is a child who does not consistently respond when called by name. Parents often describe this as the child seeming to be in their own world. They may respond to other sounds, loud noises, music, or their favourite show, but not to a familiar voice calling their name directly.
This is important to note because it can be mistaken for a hearing issue. If you are concerned, a hearing test is a sensible first step. But if hearing is confirmed to be normal and your child still does not respond consistently to their name by twelve months, it is worth raising with your doctor.
Sign 3: Delayed or Absent Speech and Language
Speech and language development varies widely between children, and not all delays point to autism. But certain patterns of language development are more commonly associated with autism than with typical developmental variation.
These include:
No babbling by twelve months
No single words by sixteen months
No two-word phrases by twenty-four months
Loss of previously acquired language skills at any age
That last point is particularly significant. A child who was developing speech and then stops using words they previously had is showing a regression that should always be assessed promptly.
Some autistic children develop language on a typical timeline but use it in atypical ways. They may repeat phrases from television or books, a pattern called echolalia. They may speak in a very literal way, struggle with back-and-forth conversation, or use language to narrate rather than communicate with others.
According to Autism Speaks, around the world 1 in 100 children are diagnosed with autism, and communication differences are among the most consistent features across those diagnoses.
Dropped in a Maze by Sonia Chand walks through the reality of navigating communication differences and everything that comes with them in the early years. Order your copy today
Sign 4: Repetitive Movements or Behaviours
Repetitive movements, often called stimming, are one of the most recognised features of autism. These are movements or behaviours that are repeated consistently and often serve a self-regulating function for the child.
Common examples in infants and toddlers include:
Hand flapping, particularly when excited or distressed
Rocking back and forth while sitting or standing
Spinning in circles repeatedly
Toe walking
Lining up toys or objects rather than using them in play
Spinning wheels on toy cars and watching them closely rather than playing with the car itself
It is important to understand that stimming is not inherently harmful. For many autistic people, repetitive movements are a way of managing sensory input, expressing emotion, or simply finding comfort. The goal should never be to eliminate stimming. The goal is to understand what it communicates about how your child is experiencing their environment.
Sign 5: Difficulty With Changes in Routine
Many autistic children have a strong need for sameness and predictability. When routines are disrupted, even in ways that seem minor to a parent, the response can be intense and prolonged.
This might look like:
Significant distress when a usual route is changed
Meltdowns triggered by unexpected transitions, like leaving the park earlier than expected
Insistence on eating the same foods in the same order
Distress if furniture is moved or items are not in their usual place
Needing the same bedtime routine performed in exactly the same way every night
Understanding this as a neurological need rather than defiance or stubbornness changes everything about how you respond to it. A child who falls apart when the routine changes is not being difficult. They are experiencing genuine distress in a world that feels unpredictable.
This is one of the areas where the shift from autism awareness to autism acceptance makes the most practical difference in daily family life. If you have not yet read the post on autism awareness vs autism acceptance, it gives important context for understanding why the way we frame these behaviours matters so much.
Sign 6: Unusual Sensory Responses
The sensory world is experienced differently by many autistic children. Some are hypersensitive, meaning they are easily overwhelmed by sensory input that most people barely notice. Others are hyposensitive, meaning they seek out intense sensory experiences and seem to have a higher threshold for pain or discomfort.
Hypersensitive responses might include:
Covering ears at sounds that do not seem loud to others
Distress around certain textures in clothing or food
Extreme reactions to bright lights or busy visual environments
Refusing to walk on grass or sand barefoot
Hyposensitive responses might include:
Seeking out strong physical pressure, wanting to be squeezed or wrapped tightly
Appearing not to notice pain, like a fall that would make most children cry
Mouthing objects well beyond the typical age for this behaviour
Craving movement, spinning, or jumping constantly
Neither pattern is better or worse. They are simply different ways of processing the world. Once you understand your child's sensory profile, you can make adjustments that genuinely reduce their daily stress levels.
Sign 7: Limited Interest in Other Children or Social Play
Most toddlers begin showing interest in other children around the age of two. They may not play together in a fully interactive way yet, but they notice each other, imitate each other, and show curiosity about what other children are doing.
Autistic toddlers may show little interest in other children. They may prefer solitary play, seem unaware of other children in the room, or not engage in the imitative play that most toddlers naturally fall into.
Pretend play is another area worth watching. By around eighteen to twenty-four months, most children begin using objects symbolically, pretending a banana is a phone or feeding a doll. This kind of imaginative, symbolic play is often delayed or absent in autistic toddlers.
This does not mean autistic children do not want connection. Many autistic children are deeply affectionate and social in their own way. But the social instincts that develop automatically in neurotypical children may need to be taught, modelled, and supported deliberately in autistic children.
The podcast covers this topic in depth, including honest conversations about what social development really looks like for autistic children and how families can support it without forcing neurotypical behavior patterns.
Listen to the podcast here and join thousands of families navigating the same questions.
What to Do If You Recognize These Signs
If you have read through this post and several of these signs feel familiar, the most important thing you can do right now is act without waiting.
Here is a simple starting point:
Talk to your paediatrician at the next appointment: Bring specific examples of what you have been observing, written down if possible. Do not wait to be asked. Bring it up yourself.
Request a developmental screening: In many countries this is a standard part of well-child checks, but it is not always done automatically. Ask for it specifically.
Do not let anyone tell you to wait and see without a clear reason: Early intervention is consistently shown to make a meaningful difference. Waiting costs time that matters.
Start reading and learning now: Understanding autism before a formal diagnosis means you are already building the knowledge you need. The best selling autism books on this topic include titles written by autistic authors, parents, and clinicians that will give you a much fuller picture than any single blog post can.
Book a coaching session here if you want to talk through what you are seeing with someone who understands the journey from the inside.
Final Thoughts
Noticing these signs in your child does not mean something is wrong. It means you are paying close attention to someone you love deeply, and that attention is the foundation of everything good that comes next.
An autism diagnosis, if that is where this leads, is not the end of anything. It is the beginning of understanding. It is the moment when the guessing stops and the real support can begin.
The families who navigate this journey well are not the ones who had all the answers early. They are the ones who stayed curious, stayed connected, and kept showing up for their child even when the road was unclear.
That is exactly what you are already doing by being here.