At a Glance
Autism regression is the loss of skills a child had already learned — usually words and social skills like eye contact or responding to their name. It most often appears between 15 and 30 months of age, and any loss of skills is a reason to call your pediatrician.
- Most common signs: language loss and social withdrawal, sometimes with new repetitive behaviors.
- Typical timing: around 21 months on average, affecting roughly one in five to one in three autistic children.
- Not caused by vaccines or parenting — large studies find no link.
- Loss of motor skills is uncommon and should be checked by a doctor promptly.
- Many children regain skills with early support like ABA and speech therapy.
What Is Autism Regression?
Autism regression means a child loses skills they already had, rather than simply making slower progress. A toddler who used to say “mama” and “ball” might stop using those words. A child who enjoyed peekaboo might lose interest in the game or the person playing it. You may also hear this called regressive autism or autistic regression.
These changes can leave you wondering what’s happening and what your child needs. Knowing how skill loss differs from slower progress can help you describe what you’re seeing when you speak with your pediatrician.
Regression vs. a plateau
During a plateau, your child isn’t learning new skills for a while, but they still use the ones they have. With regression, previously learned skills disappear. That distinction can be hard to spot as it happens. Many parents only recognize it when they look back at what their child used to do.
What Are the Signs of Autism Regression?
The changes parents notice vary, but they tend to involve the following areas.
Language loss
Language loss is the most common type of regression. You might notice that your child no longer uses familiar words or phrases, or has gone quiet. Speech regression in autism can happen over several weeks or appear more suddenly.
Social withdrawal
A child may stop responding to their name, make less eye contact, or seem less interested in people. Games they once enjoyed, such as peekaboo, may no longer hold their attention. These changes often happen alongside language loss.
New or increased repetitive behaviors
You may notice more repetitive movements, often called stimming. Some children also develop new sensory sensitivities, such as covering their ears in response to everyday sounds.
Changes in motor or self-care skills
Research shows that losing motor skills is uncommon in autism regression. If your child loses the ability to walk, use their hands, or feed themselves, speak with a doctor promptly. These changes need medical attention because they can point to other conditions.
Here’s a quick summary of the signs and what parents should know:
When Does Autism Regression Happen?
Autism regression usually begins between 15 and 30 months of age. A review of 85 studies found that children were about 21 months old, on average, when skill loss began.
There isn’t always a clear moment when things change. Studies that follow babies closely from birth, often younger siblings of autistic children, show that regression can happen gradually and may start earlier than parents notice.
What Causes Autism Regression?
Researchers don’t yet know exactly what causes autism regression. Much of the research looks at genetics and how the brain develops during the first years of life. Parenting does not cause regression.
Parents sometimes wonder about vaccines because routine vaccinations and regression often happen around the same age. That overlap in timing is a coincidence. Large studies involving millions of children have found no link between vaccines and autism, including regression. The American Academy of Pediatrics explains the research in more detail.
Can Older Children and Teens Regress?
Yes. Skill regression in autism can happen beyond the toddler years, though it’s less common. Older children and teens may temporarily lose skills during periods of stress, illness, major change, or exhaustion. Support with skills such as emotional regulation can help children cope during difficult periods.
Later skill loss can also be linked to medical issues or conditions that often occur alongside autism. If your older child or teen is losing skills, make an appointment with their doctor to discuss the changes.
When Should You Call Your Pediatrician?
Call your pediatrician whenever your child loses skills, whatever their age. Before the appointment, write down what has changed and when you noticed it. Include specific examples: words they no longer use, games they’ve stopped playing, or changes in how they respond to you.
Your pediatrician can check for medical causes and refer your child for an evaluation if needed. If your child already has a diagnosis, our guide to what to do after an autism diagnosis explains next steps.
Can Regressive Autism Be Reversed?
Autism itself doesn’t go away, and regression isn’t something to “cure.” Many children do regain lost skills or learn new ones with early support, but progress is different for each child.
Understanding autism levels can help you make sense of the support your child may need. Starting support early gives your child the most time to learn and grow.
How ABA Therapy Helps After Skill Loss
ABA therapy can help a child work on lost skills in small, manageable steps. A BCBA begins with what your child can do now and uses that information to plan support. After skill loss, this includes:
- Reassessing current skills. The BCBA looks at your child’s current abilities so the goals reflect where they’re starting today.
- Reteaching lost skills in small steps. Each skill is broken down and practiced with encouragement.
- Adding other ways to communicate. If your child is no longer using words, picture cards, signs, or devices can help them express their needs. Read about ABA therapy for nonverbal children and how ABA builds communication skills.
- Tracking progress closely. The team collects data as they work with your child, helping them notice any new slips early.
How United Care ABA Supports Families Through Regression
When your child’s skills change, you may have questions about what to practice at home and how to recognize progress. At United Care ABA, our BCBAs begin by understanding your child’s current abilities, then build a plan to support learning and work on lost skills.
Parents are part of that work. We help you understand what your child is practicing and how to support it at home. Our team works with children and teens, adjusting support as their needs change.
FAQs
At what age does autism regression happen?
Most often between about 15 and 30 months of age. A large review of 85 studies found the average age of skill loss was just under two years. Loss of skills in an older child or teen is less common and should be checked by a doctor.
What are the causes of regressive autism?
Researchers do not yet know exactly what causes it. Studies point to genetics and differences in early brain development, and parenting does not cause it. Large studies involving millions of children have found no link between vaccines and autism, including regression.
How long does autistic regression last?
There is no set length. For some children the loss happens over a few weeks, and for others it is gradual over several months. Many children then go through a period where skills level off before new progress begins.
What does regression look like in autism?
A child may stop using words they used before, respond less to their name, make less eye contact, lose interest in games like peekaboo, or show more repetitive behaviors. Changes are usually noticed in language and social skills first.
Can regressive autism be reversed?
Autism itself does not go away, but many children regain lost skills or build new ones with early support such as ABA therapy and speech therapy. Progress looks different for every child, and starting support early gives children the most time to learn.
1 References
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Barger, B. D., Campbell, J. M., & McDonough, J. D. (2013). Prevalence and onset of regression within autism spectrum disorders: A meta-analytic review. Journal of Autism and Developmental Disorders, 43(4), 817-828. https://doi.org/10.1007/s10803-012-1621-x
