The early signs of autism in children under 2 fall into four categories: social differences (limited eye contact, not responding to their name by 12 months), communication delays (little or no babbling by 12 months, few gestures like pointing or waving by 14 months), repetitive behaviors (hand-flapping, rocking, intense routine dependence), and sensory differences (over- or under-reacting to sound, texture, or pain). These signs can appear as early as 6–18 months — well before most children are formally diagnosed around age 2–3.
Autism Spectrum Disorder (ASD) is a developmental condition that affects communication, social interaction, and behavior differently in every child, which is why it’s called a “spectrum.” No two children show identical signs, and having one or two of these traits doesn’t mean a child is autistic — but recognizing the pattern early is what makes timely evaluation and intervention possible. Below, we break down each sign by category, what it looks like day to day, and when to talk to a pediatrician.
At a Glance: 12 Early Signs of Autism Under Age 2
| Category | Signs to watch for |
|---|---|
| Social | Limited eye contact, no response to name by 12 months, little interest in games like peek-a-boo |
| Communication | No babbling by 12 months, few/no gestures (pointing, waving) by 14 months, poor response to verbal cues |
| Behavioral | Hand-flapping, rocking, or spinning objects; distress at routine changes; fixating on parts of objects |
| Sensory | Over- or under-reaction to sound, texture, pain, or temperature; unusual visual fixation (watching objects spin, viewing from the side of the eye) |
Understanding Autism Spectrum Disorder
Autism Spectrum Disorder (ASD) is a complex neurodevelopmental disorder that significantly impacts communication, social interaction, and behavior. Individuals with ASD often face challenges in both verbal and nonverbal communication, making social interactions more difficult. Additionally, repetitive behaviors and a strong preference for routines are common characteristics.
ASD is referred to as a spectrum disorder because it affects individuals in varying degrees and manifests in different ways. Some people with ASD may require substantial support in their daily lives, while others might need minimal assistance and may not exhibit obvious signs of the disorder. This variability underscores the importance of understanding each individual’s unique needs and strengths within the autism spectrum.
Importance of Early Diagnosis of Autism
Early diagnosis matters because it opens the door to intervention when a child’s brain is most adaptable — typically enabling the most progress in physical, cognitive, behavioral, social, and language development. If any concerns arise before age 2, it’s worth seeking an evaluation rather than waiting.
Diagnosis of autism is not done by medical tests but by observation of behaviors which is guided by experts who know the Symptoms of Autism. In the diagnosis of the disorder, the DSM-5, a manual by the American Psychiatric Association, is helpful. Signs are attained in early childhood thus interventions are possible from 18 months (1.5 years) of age. The major signs are slow speech, lack of social communication or eye contact, and repetitive behaviors. A child’s doctor plays a crucial role in early evaluation, testing for hearing issues, and screening for autism. These signs should be recognized for early detection and assistance.
Developmental Milestones and Autism
Developmental milestones are key indicators of a child’s growth and progress, encompassing significant events such as sitting, walking, and talking. For children with Autism Spectrum Disorder (ASD), there may be noticeable delays or differences in achieving these milestones. Recognizing these early signs of autism is crucial for timely intervention and support.
Understanding and monitoring developmental milestones can help parents and caregivers identify potential signs of autism early on. For instance, if a child shows delays in speech, limited eye contact, or a lack of interest in social interactions, these could be early signs of autism. By keeping a close watch on a child’s development, parents can seek professional advice and support if they notice any developmental differences, ensuring that their child receives the necessary interventions to thrive.
Autism Red Flags in Infants & Toddlers in 2 Year Old
The early warning signs of autism in infants and toddlers are crucial for parents and caregivers to recognize. The early signs of autism in toddlers age 2 can often be detected at 18 months or younger. When the child has reached 2 years, a diagnosis made by an experienced professional is mostly reliable. Yet not all autistic children exhibit all of these signs, and many other children may exhibit a few of these symptoms without being autistic. Here is a list of autism red flags in infants and children under 2 years old, categorized by developmental areas;
Social Differences
➡️ Limited Eye Contact:
Poor eye contact is frequently the first sign parents notice. Most infants make consistent eye contact by 2–3 months and actively seek it out during feeding or play by 6 months. A toddler who rarely makes eye contact, or only does so briefly and without warmth, may be showing an early sign of a social communication difference.
➡️ Reduced Interest in Social Interactions:
Younger children who may have Developmental Signs of autism, however, unlike their peers, do not demonstrate interest in social games, like peek-a-boo or other interactive plays that fascinate toddlers. It looks as if they are indifferent to efforts to include them in their social circle.
➡️ Lack of Response to Name:
At one year old, a toddler then will turn their head on hearing their name called. Non-response is a red flag of autism including problems with basic social awareness and responsiveness.
Communication Challenges
➡️ Delayed Babbling:
Although most children begin babbling at around 6 months, infants showing signs of autism may experience delays or even a total lack of babbling by the age of 12 months. This lag is an early sign of Communication Issues.
➡️ Limited Use of Gestures:
Symbolic movements such as pointing to show interest or waving goodbye are also important hallmarks. Recognizing early signs of various developmental disorders, such as limited use of gestures, is crucial for timely diagnosis and intervention. Gestures in toddlers who have Developmental Delays at 14 months can be significantly reduced or even not present at all.
➡️ Poor Response to Verbal Cues:
Failure to understand and respond to verbal instructions or not participating in vocal mimicry games could be a sign of early communication problems of autism.
Behavioral Signs
➡️ Repetitive Behaviors:
Typical examples of repetitive movements among children with autism include hand-flapping, rocking, and spinning objects. These behaviors are generally self-soothing processes.
➡️Routine Dependence:
Infants or toddlers manifesting the early symptoms of autism may become greatly distressed at any alteration in their routine or surroundings. This desire for certainty might be simply a result of the overwhelming uncertainty that change is for them.
➡️ Focused Interests:
An intense focus on specific toys, objects, or topics is common and may include fixating on parts of objects, such as the wheels of a toy car, rather than using them as intended.
Sensory Sensitivities
➡️ Over- or Under-Sensitivity:
The sensory responses of autism in infants may be unusual. This may vary from a dislike for certain sounds and textures to an inability to react to pain or intense cold.
➡️ Unusual Viewing of Objects:
Obsessive looking at objects from unusual angles such as the side of the eye, or watching objects spin or move can also be a sign of autism. This characteristic is a manifestation of discrepancies in Sensory Processing and Integration.
If you notice any of these symptoms, it is necessary to write them down and make sure that the child’s pediatrician knows your observations. Keep track of the behaviors you observe, their time, and frequency. A pediatrician can help decide if these signs are normal or if they should be checked.
Children with ASD benefit greatly from early intervention. After an autism diagnosis, services such as ABA therapy and speech therapy can help develop communication, learning, and daily living skills.
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Recognizing Signs of ASD in Early Childhood
Early diagnosis of Autism Spectrum Disorder (ASD) leads to the child’s improved quality of life. The key figures in this process are parents and caregivers who are frequently the first ones to detect the early symptoms. The following are some tools and approaches for identifying ASD in early childhood;
Regular Observations
Parents or caregivers should monitor the child’s general behavior, social interactions, and communication skills. Be observant of indications such as repetitive actions, limited eye contact, late language development, and challenges in social interactions.
Developmental Screening Tools
There are a number of standardized screening tools that can assist in identifying children who are at risk of ASD. These are the Modified Checklist for Autism in Toddlers (M-CHAT), the Screening Tool for Autism in Toddlers and Young Children (STAT), and the Autism Spectrum Rating Scales (ASRS). These tools are often used by pediatricians during regular check-ups.
Follow-Up Appointments and Developmental Assessments
Periodical pediatric check-ups are essential to monitor the progress of your child. Developmental Screening by the American Academy of Pediatrics includes screening at 9, 18, and 24 or 30 months and autism-specific screening at 18 and 24 months.
Trust Your Instincts
A parent usually has a vivid understanding of his/her child’s development. Do not hesitate to discuss any concerns regarding your child’s behavior, social skills, or communication abilities with your healthcare provider.
While parents and caregivers play a critical role in early detection, it’s essential to remember that an ASD diagnosis is a comprehensive process involving multiple steps and professionals. If your child is showing signs of ASD, a comprehensive evaluation by specialists such as a psychologist, neurologist, psychiatrist, and speech therapist may be recommended.
What If the Child Shows Some Early Signs of Autism?
When autism symptoms appear in a child the best thing to do is ask the pediatrician or the specialist in child development for their advice on the matter. Early intervention in development gives a great chance to the child and often involves services such as ABA and Speech Therapy Recognition and action to the main signals by the time a child may change the path of his or her development dramatically. Parents and caregivers play the more important role in this process because they are the ones who know early autism signs, demand an environment suitable for the child, and stay by the child all the way.
ABA Therapy being used in Early Intervention for ASD (Autism Spectrum Disorder) is undoubtedly one of the most effective treatments for the condition. ABA is a behavioral therapy that works on boosting natural behaviors such as social skills, communication, reading comprehension, and academic skills as well as improved adaptive skills like fine motor skills, hygiene, grooming, clothing, home living skills, punctuality, and proficiency.
Read Next –Unit 1: ABA-Based Guide to Early Intervention Services for Children with Autism: A Parent’s Handbook
Frequently Asked Questions & Answer
Can Autism Be Diagnosed Under 2?
Yes. While a fully reliable diagnosis is more common around age 2, signs can appear as early as 18 months, and some children are screened and diagnosed even younger with the help of a specialist.
What are the Problematic Behaviors of a 2-Year-Old with Autism?
Common behaviors include limited eye contact, not responding to their name, repetitive movements like hand-flapping or rocking, intense distress over routine changes, and fixating on parts of objects rather than playing with them typically.
How do I Know If My Toddler has Mild Autism?
Milder signs can be subtle — slightly delayed speech, occasional difficulty with eye contact, or a strong preference for routine without full-blown meltdowns. Because these signs can be easy to miss, a developmental screening with a pediatrician is the most reliable way to know for sure.
Do 2-Year-Olds with Autism Cry a Lot?
Some do — heightened sensory sensitivity or distress around changes in routine can lead to more frequent or intense crying, though this varies significantly from child to child and isn’t present in every case.
Can a Child Show Symptoms of Autism and Not Be Autistic?
Yes. Many of these signs can appear in typically developing children or those with other developmental differences. A single sign isn’t a diagnosis — a professional evaluation is needed to know for sure.
What is the earliest age autism can be detected?
Signs can sometimes appear as early as 6 to 12 months — such as reduced eye contact or delayed babbling — though most reliable screening happens between 18 and 24 months, in line with American Academy of Pediatrics guidelines.
What Are the First Signs of Autism in a Baby (0–12 Months)?
In babies under a year, early signs can include limited or no babbling by 12 months, reduced eye contact, not smiling responsively, and limited interest in social games like peek-a-boo.
Conclusion
Early detection of the beginning symptoms of autism in children under two years old is of great importance to parents and those who take care of them. Early diagnosis and treatment give children the tools to build coping skills and thrive despite these challenges. Children with autism who receive adequate support and treatment have the potential to live good lives. Thus, empowering them with knowledge and vigilance is necessary in caring for children with ASD and their families. If you notice anything that concerns you, don’t hesitate to seek professional advice. Programs like AutismCOE’s Early Intervention Program are designed to help children with ASD reach their full potential. Remember, early detection and intervention can make a significant difference.
Esha Bhasin
Esha Bhasin is the award-winning CEO & Founder of Autism Center of Excellence (AutismCOE). She was honored with the 2026 Triangle Business Journal Corporate Leadership Award. Before founding AutismCOE, she spent over nine years as a Senior Consultant at KPMG US. She specialized in Medicaid and State Public Health. Inspired by her own family's autism journey, she founded AutismCOE to improve access to quality autism care. Esha writes about autism care, Medicaid policy, and healthcare operations.
