Every child grows at their own pace, but most toddlers follow a familiar path as they learn to babble, point, wave and speak. When a child moves away from that path, parents are often the first to notice. Learning about the early signs of autism in toddlers can help you understand what you are seeing, ask better questions at checkups and find support sooner rather than later.
Autism spectrum disorder (ASD) is a developmental condition that affects how a child communicates, interacts with others and experiences the world. The signs are not the same for every child. Some toddlers show clear differences in their first year, while others appear to develop typically at first and then lose skills they had already gained. That is why it helps to know the full range of possible signs instead of looking for one single red flag.
Why Early Recognition Matters
Public health agencies describe autism as a spectrum, which means the signs can be mild, moderate or significant, and they can change as a child grows. Early identification is important because it gives families a chance to learn about their child’s development and connect with services that match their needs. In Canada, resources on autism spectrum disorder include practical information on signs and characteristics, supports and services, and guidance for professionals and families. The sooner a concern is raised, the sooner a family can begin exploring those options.
Because every child develops on their own timeline, a single missed milestone does not automatically point to autism. What matters is the overall pattern of development, including whether skills are appearing in the expected order and whether a child is losing skills over time.
Signs That May Appear by 12 Months
Some of the earliest signs of autism in toddlers can show up before a child’s first birthday. Parents and doctors may notice that a baby is not hitting certain social and communication milestones. Common signs around this age include:
- Little or no babbling
- Little or no eye contact
- Showing more interest in objects than people
- Appearing not to hear when spoken to directly
- Little or no back-and-forth gestures such as pointing, showing, reaching or waving
- Not responding to their name by 9 months of age
- Not showing facial expressions such as happy, sad, angry or surprised
Parents often notice these differences during everyday moments: at mealtime, during bath time, or while playing on the floor. A baby who does not look toward a familiar voice, who rarely smiles back, or who seems more fascinated by a toy than by the people around them may be communicating less than expected for their age. Any one of these signs alone does not mean a child has autism, but a pattern of several signs is worth discussing with a healthcare provider.
Signs That May Appear by 24 Months
As toddlers move through their second year, the early signs of autism can become more noticeable, especially as language and play become more complex. Signs of autism in toddlers up to 24 months may include:
- Limited or no speech
- Only walking on their toes
- Difficulty following simple verbal instructions
- Talking or babbling in a voice with an unusual tone
- Displaying unusual sensory sensitivities, such as strong reactions to sounds, textures or lights
- Displaying unusual body or hand movements
- Repetitive behaviours, such as lining up toys or repeating the same action
A toddler who does not use single words by 24 months, who cannot follow a simple direction such as “come here” or “give me the ball”, or who walks only on their toes may be showing signals that deserve attention. Toddlers at this age are also expected to use simple gestures and begin combining words. A child who never points, who does not wave goodbye, or who does not seem to understand simple requests may be showing differences in how they process language and social cues. Unusual sensory responses, such as covering ears at everyday sounds or refusing certain fabrics, can also appear during this period.
Three Early Signs That Paediatricians Highlight
The American Academy of Pediatrics points to three early signs of autism in children that parents and doctors should watch closely. These three signs are frequently present in young children who later receive an autism diagnosis.
Delay in or Lack of Joint Attention
Joint attention is the ability to share focus with another person on the same object or activity. When a toddler points at a dog and looks back at a parent to make sure they are looking too, that is joint attention in action. A delay in joint attention means a child may not point to show interest, may not follow a parent’s point, and may not look back and forth between a person and an object. Because joint attention is the foundation for language and social learning, its absence is a meaningful early sign.
Language Delays and Differences
Language delays show up in many ways. A child may have little or no babbling as an infant, may say few or no words by 24 months, or may lose words they once used. Differences can also appear in the way a child talks or babbles, such as an unusual tone or pitch. Some children develop language late but then catch up, while others continue to show delays. The pattern matters as much as the timing, which is why keeping a simple record of what a child says and when can be helpful for doctor visits.
Regression in Developmental Milestones and Skills
Regression is one of the most important signs to understand. A toddler who has been saying “mama” and “dada” may stop speaking. A child who waved goodbye may no longer wave. This loss of previously mastered skills, whether in language, social interaction or play, is a serious signal that should not be ignored. Regression is not something to wait out. If a child loses skills at any point, a doctor should be told right away.
Motor Development and Other Possible Signs
Autism is often described in terms of communication and social behaviour, but movement can also provide clues. Some research on early signs notes that delays in motor development, including delayed rolling over, pushing up and crawling, may appear in the first year of life. These physical delays can be among the earliest clues a parent notices, sometimes before differences in talking or eye contact become obvious. Specialists who study early development encourage parents to trust their instincts; when a parent suspects something is wrong with their child’s development, that suspicion deserves to be taken seriously.
Signs at a Glance
Because autism looks different in every child, a simple list can be easier to use than a long description. The table below organizes some of the common early signs by age and area of development.
| Area of development | Possible signs by 12 months | Possible signs by 24 months |
|---|---|---|
| Communication | Little or no babbling | Limited or no speech; babbling or talking in an unusual tone |
| Social interaction | Little or no eye contact; no back-and-forth gestures such as pointing, showing or waving | Difficulty following simple verbal instructions; more interest in objects than people |
| Movement and behaviour | Unusual body or hand movements | Walking only on toes; repetitive behaviours |
A table like this is a starting point, not a checklist for diagnosis. Some children show signs from more than one area, while others show only a few. The goal is to help parents recognize what might deserve a closer look.
What to Do If You Notice Early Signs
If you recognize some of these early signs of autism in your toddler, the next step is straightforward: talk to your child’s doctor or pediatrician. Describe what you are seeing at home, including examples of specific behaviours and when you first noticed them. It can help to keep a simple record of your child’s words, gestures and play over a few weeks so you can share concrete examples rather than vague impressions.
Early identification does not mean jumping to a diagnosis. It means opening a conversation. Public health resources in Canada offer information on supports and services for families, and healthcare providers can guide you toward referrals and assessments in your community.
For families in the Greater Toronto Area, including Mississauga, Brampton, Hamilton and nearby communities, a range of supports are available for children with autism spectrum disorder. Options such as ABA therapy, speech-language pathology and occupational therapy can help with communication, daily skills and overall development. Many providers offer both in-home and centre-based services so families can choose what fits their routine.
Frequently Asked Questions
At what age is autism first noticed?
Autism can be noticed at different ages because every child develops differently. Some signs, such as not responding to a name by 9 months or showing little or no babbling by 12 months, can appear in the first year. Other signs become clearer between 12 and 24 months as language and social expectations grow. Some children are not identified until later, especially when their differences are mild.
What are the first signs of autism in a 2 year old?
In toddlers up to 24 months, early signs may include limited or no speech, walking only on their toes, and difficulty following simple verbal instructions. Parents may also notice little or no eye contact, more interest in objects than people, and unusual body or hand movements. A lack of joint attention, such as not pointing or not showing objects to share interest, is another signal worth raising with a doctor.
What is the biggest red flag for autism?
Regression is among the most significant red flags. A child who loses words, social gestures or other skills they had already mastered needs prompt attention. Delays in joint attention and limited or no speech are also major signs. No single behaviour confirms autism on its own, so a combination of signs, or any sudden loss of skills, should be discussed with a healthcare provider without delay.
When should I talk to my child’s doctor?
It is reasonable to talk to a doctor as soon as you notice that your child is missing milestones or when something about their development feels different. Researchers who study early autism note that when parents suspect something is wrong with their child’s development, that instinct deserves attention. Early conversations give families more time to understand their child’s needs and explore the supports and services available to them.