How Are Children with ASD Diagnosed?

Many parents say they “just knew” their child was on the spectrum. Others may recognize challenging behaviors in their children but not realize they are early signs of autism. Each individual with autism is unique, and no two people on the spectrum are exactly alike. However, there are some specific signs that a person may have autism.

Toddler girl in a floral dress playing on a white rug with a colorful toy duck shape sorter

Early Signs of Autism

In many cases, early signs of autism are evident by as young as 6 months of age. Other children may seem to be developing normally until they are a little older and then regress in their language or social development. Some of the earliest signs of autism in toddlers can include: 

By 6 Months of Age 

By 9 Months of Age 

By 12 Months of Age 

By 16 to 18 Months of Age 

By two years of age 

Diagnosing Autism in Older Children and Teens

In some cases, diagnosing autism in children under the age of two is not possible. Sometimes language and social skills begin to develop, but regress or stop as the child gets older. In other cases, parents may not recognize the signs of autism in toddlers, or the signs may not appear until later. For this reason, the AAP has begun to recommend that all children be screened for autism at their well-child visits. Not all doctors may be aware of this change, so ask your doctor if you have any concerns about your child’s development. 

Early signs of autism in children older than two years include: 

Diagnosing Autism in Children

Autism cannot always be diagnosed based on signs alone. There may be alternative reasons for any of these signs or symptoms, such as hearing loss or another neurological or developmental disorder, such as ADHD or ODD. Children from a traumatic background may also have symptoms that mimic ASD. 

Children often have more than one developmental disorder at the same time. This is called co-morbidity, and each disorder may require its own therapies and treatments. 

Some of the ways doctors and therapists work with families to secure an autism diagnosis in children include: 

Ruling out Medical Disorders 

Hearing and eyesight should be evaluated to ensure there are no sensory issues causing your child’s behaviors. In rare cases, a medical condition could also be to blame. 

Take the M-CHAT-R Screening Questionnaire

This is a questionnaire you can take to determine if your child has common early signs of autism. It is not enough to secure a diagnosis, but it will let you know if a discussion with your doctor is warranted. 

Get Further Analysis 

Once alternative options have been ruled out, your doctor may decide to proceed with further behavioral and developmental testing. This will include observing your child’s social and developmental skills and gathering thorough information from you and other family members on your child’s behaviors at home. 

Happy little girl in a dress pretending to fly

What to do After the Diagnosis

If all testing shows that your child is on the autism spectrum, you may have many questions about how to help him reach his full potential. While autism can present challenges, it doesn’t mean your child can’t have a full and meaningful life. Getting your child into therapy will help them learn skills they will need to achieve their goals in school and in their social interactions. Excel Together’s therapists can help you develop a therapeutic plan personalized to your child. Contact us today to get started.


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