Autism, or autism spectrum disorder (ASD), is a neurodevelopmental condition that affects how a person communicates, interacts socially, processes sensory information, and engages with the world around them. It is present from early childhood and is typically lifelong, with characteristics and support needs that vary widely from one person to the next.
This guide walks you through what autism is, what early signs can look like, how a diagnosis is made, and the therapies that can support your child. We will also share what families in Indiana can expect when they are ready to take the next step.
Key Takeaways
- Autism spectrum disorder is a neurodevelopmental condition that affects social communication, behavior, and sensory processing, with a wide range of presentations across individuals.
- Early signs can appear by 12 to 18 months and may include delayed speech, limited eye contact, repetitive behaviors, and intense focus on specific interests.
- A formal autism diagnosis from a licensed Clinical Psychologist is the first step to accessing insurance-covered therapies like ABA, speech, and occupational therapy.
- Evidence-based therapies such as Applied Behavior Analysis (ABA), speech therapy, and occupational therapy can support communication, daily living, and social skills.
- Indiana families can access in-house diagnostic testing and center-based ABA therapy through ABC, with little to no waitlist and most major insurance and Medicaid accepted.
Understanding Autism Spectrum Disorder
Autism spectrum disorder is a neurodevelopmental condition that shapes how a child experiences communication, relationships, and the sensory world. It is not an illness or something a child outgrows, and it does not reflect parenting choices. Children on the autism spectrum often have unique strengths alongside areas where they benefit from support.
The word “spectrum” matters here. Two children with the same diagnosis can look very different from each other in how they speak, play, and respond to their environment. One child may be highly verbal and deeply focused on a favorite topic, while another may communicate primarily through gestures or assistive tools.
How the DSM-5 Defines Autism Spectrum Disorder
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) is the clinical reference used to diagnose autism in the United States. It defines autism spectrum disorder by two core areas: persistent differences in social communication and social interaction, and the presence of restricted, repetitive patterns of behavior, interests, or activities. These characteristics must be present in early childhood and affect daily functioning, even if they become more noticeable as social demands grow.
Early Signs and Symptoms of Autism in Children
Signs of autism can appear as early as 12 to 18 months, though some children are not identified until preschool or later, especially when their early differences are subtle. No two children present identically, so the goal is not to match every item on a list but to notice patterns that feel meaningful to you.
Many parents describe a quiet sense that something is different before they can name it. That instinct is worth taking seriously.
Social Communication and Interaction Differences
Social communication differences are often the earliest signs families notice. These can include:
- Limited or inconsistent eye contact
- Delayed speech or loss of previously used words
- Not responding to their name by 12 months
- Difficulty with back and forth play or conversation
- Limited use of gestures like pointing, waving, or showing objects
- Trouble understanding facial expressions or tone of voice
Restricted Interests and Repetitive Behaviors
The second area involves restricted and repetitive behaviors. Common examples include lining up toys, repeating words or phrases (sometimes called echolalia), strong attachment to routines, intense interest in a specific topic, and repetitive movements like hand flapping, rocking, or spinning. Sensory processing differences often show up here too, such as covering ears in noisy places, avoiding certain food textures, or seeking out deep pressure and movement.
Signs That May Appear in Toddlers vs. School-Age Children
In toddlers, signs often center on speech delays, limited joint attention, and difficulty with pretend play. In school-age children, differences may surface as struggles with peer friendships, trouble with transitions, intense reactions to changes in routine, or challenges in the classroom that look like inattention or anxiety. Teens and young adults may seek support around social nuance, organization, emotional regulation, and independence skills.
When to Talk to Your Child’s Pediatrician
If you are recognizing several of these patterns in your child, talking to your pediatrician is a reasonable next step. You do not need a referral to ask questions or to seek a formal evaluation. If you are in Indiana and want to move forward without a long wait, our team can also walk you through what an in-house autism diagnostic evaluation looks like and help you understand your options.
What Causes Autism? What Research Tells Us
There is no single cause of autism. Research suggests that autism develops through a complex mix of genetic and biological factors that shape how the brain develops before birth and in early childhood. Scientists continue to study these influences, and our understanding grows each year.
Genetic and Neurological Factors
Genetics play a significant role. Autism often runs in families, and many genes have been identified that may contribute to how the brain wires itself for communication, sensory processing, and social interaction. Brain imaging research also shows differences in how certain regions develop and connect in children on the autism spectrum. These are biological differences, not the result of anything a parent did or did not do.
Why Early Identification Still Matters Regardless of Cause
While researchers continue to study causes, early identification remains one of the most meaningful steps a family can take. Early intervention can support the development of communication, social, and adaptive skills during the years when the brain is most receptive to learning. Even if your child is older, beginning support at any age can still help build skills and independence.
How Autism Is Diagnosed
A formal autism diagnosis is the essential first step toward accessing therapy services and insurance coverage. There is no blood test or brain scan that diagnoses autism. Diagnosis is based on careful observation, structured assessment tools, and a thorough review of your child’s developmental history.
What a Comprehensive Autism Evaluation Includes
A comprehensive autism evaluation, sometimes called an autism test, typically involves several parts. Families complete questionnaires about developmental milestones, behavior, and daily life. The evaluating clinician observes the child directly using standardized tools that measure social communication, play, and behavior. The clinician also interviews caregivers to understand the child’s history and current functioning across home, school, and community settings. The result is a written report that includes scores, a formal diagnosis determination, and personalized recommendations for next steps.
Who Conducts an Autism Diagnosis
In our centers, evaluations are conducted by a licensed Clinical Psychologist with training in neurodevelopmental disorders. Pediatricians, developmental pediatricians, and certain other licensed psychologists can also diagnose autism. What matters most is choosing a provider experienced in evaluating children and able to deliver a report that insurance will accept for therapy authorization.
What Happens After a Diagnosis Is Confirmed
Receiving a diagnosis can bring a mix of emotions, including relief at finally having answers and uncertainty about what comes next. After diagnosis, our team helps families transition into therapy services, including center-based ABA therapy, speech therapy, and occupational therapy, depending on your child’s needs. The written report also becomes the foundation for school supports, insurance authorizations, and any future evaluations your child may need.
Therapies and Supports That Can Help Children with Autism
Therapy is not about changing who your child is. It is about building skills, expanding communication, and opening up what is possible for them in everyday life. Several evidence-based therapies can support children with autism, and they often work best together.
Applied Behavior Analysis (ABA) Therapy
Applied Behavior Analysis, or ABA, is one of the most widely researched therapies for children with autism. ABA uses individualized treatment plans, structured teaching, and positive reinforcement to support communication, daily living skills, school readiness, social skills, and emotional regulation. In our centers, one to one sessions are delivered by Registered Behavior Technicians (RBTs) under the supervision of a Board Certified Behavior Analyst (BCBA) or Board Certified Assistant Behavior Analyst (BCaBA). Treatment plans are reviewed regularly and adjusted based on your child’s progress.
For older children, our L.I.F.E. program (Learning in Functional Environments) focuses on functional skills, hygiene, job readiness, and the independence skills teens and young adults need for adult life.
Speech Therapy and Communication Support
Speech therapy, delivered by a Speech-Language Pathologist, can support spoken language, alternative communication systems, social communication, and feeding skills. When speech therapy and ABA are coordinated, children often benefit from consistent strategies across sessions, which can support stronger generalization at home and in the community.
Occupational Therapy for Daily Living Skills
Occupational therapy, provided by an Occupational Therapist (OT), focuses on the skills children need to participate in daily life. That can include fine motor skills, self care routines like dressing and brushing teeth, handwriting, sensory regulation strategies, and play skills. Like speech therapy, OT works best when integrated with the rest of your child’s care plan.
Why Starting Early Can Make a Difference
Early intervention takes advantage of the brain’s natural ability to learn and adapt during the earliest years. Research suggests that beginning therapy in the toddler and preschool years often helps with communication, social engagement, and adaptive behavior. That said, support at any age can be meaningful, and we routinely work with school age children, teens, and young adults.
Getting Started: From First Concerns to a Clear Path Forward in Indiana
Families in Indiana can access comprehensive autism diagnostic evaluations for children up to age 12 through our in-house team. After a quick benefits check and intake, an appointment is typically available within about four weeks. The evaluation takes place in person with a licensed Clinical Psychologist, and a detailed written report with scores and personalized recommendations follows in about two weeks. From there, we help your family transition into therapy services if that is the next step.
Insurance, Medicaid, and Reducing Barriers to Care
We understand that cost and coverage are real concerns. We are in-network with most major insurance providers and most Medicaid networks. Our team can help verify benefits, explain coverage options, and guide families through the enrollment process. If your child does not yet have a formal autism diagnosis, we may recommend beginning with Diagnostic Testing before starting therapy services.
ABC’s Indiana Locations and How to Reach Our Team
As Indiana’s first ABA provider, founded in 1995, we have grown to more than 21 center locations across the state. Whether you are early in the journey of understanding what autism is, or ready to schedule an evaluation, our clinical team is here to help. You can find an ABC center near your Indiana community or get started with our team when you are ready.
Ready to Take the Next Step?
If you have questions about your child’s development or are ready to explore a formal evaluation, our Indiana clinical team is here to listen and help you understand your options. There is no pressure and no obligation, just a conversation to help you find a clear path forward. Connect with our team to get started whenever you are ready.
FAQ
What is the difference between autism and autism spectrum disorder?
There is no clinical difference between autism and autism spectrum disorder (ASD); the terms refer to the same neurodevelopmental condition. The DSM-5 combined what were previously separate diagnoses (including Asperger’s syndrome and pervasive developmental disorder) into one umbrella term: autism spectrum disorder. The word “spectrum” reflects that characteristics and support needs vary widely from person to person.
At what age can autism be diagnosed?
Autism can often be reliably diagnosed by age 2, and some children show recognizable signs as early as 12 to 18 months. Many children, however, are not diagnosed until preschool age or later, especially when early differences are subtle or when girls present in ways that differ from common diagnostic patterns. Our centers provide in-house diagnostic evaluations for children up to age 12.
Can a child have autism without showing obvious signs?
Yes. Some children on the autism spectrum develop strong verbal skills early or learn to mask social differences, which can delay identification. Signs may only become apparent as social, academic, or sensory demands increase during the school years. If something about your child’s development or behavior feels different, it is reasonable to seek a professional evaluation even when signs are subtle.
Is autism more common in boys than girls?
Autism is currently diagnosed more often in boys than in girls, though research suggests that girls may be underdiagnosed or diagnosed later. Girls on the autism spectrum sometimes present differently, often with more internalized characteristics or social strategies that can mask underlying differences. A thorough diagnostic evaluation can help identify autism in any child, regardless of gender.
What is the first step if I think my child might have autism?
The first step is talking with your child’s pediatrician about your observations and asking about a developmental screening. You can also reach out directly to a provider that offers comprehensive autism diagnostic evaluations. In Indiana, our team can guide you through scheduling, insurance verification, and what to expect from the evaluation process, with little to no waitlist.