Quick take: About 1 in 31 (≈3.2%) eight‑year‑olds in the United States are now identified with autism spectrum disorder (ASD), according to the latest CDC ADDM Network report published in 2025. Early recognition of red flags—especially the subtle ones—remains the key to timely support.
2025 Snapshot: Why Early Detection Matters
- Average age of diagnosis in the U.S. is still around 4 years, yet reliable signs can appear by 12 months.
- Diagnosis is over 3 times more common in boys, but researchers believe many girls remain undiagnosed until later childhood because their signs can look different.
- Early intervention services launched before age 3 show the highest impact on language and social outcomes.
While these signs are common in children, it’s important to note that autism can present differently in girls. Being aware of the signs of autism in girls can help ensure early detection for all children.
Early Developmental Signs (0 – 12 Months)
- Lack of social smiling by 6 months
- Limited eye contact or tendency to look past caregivers
- Doesn’t respond to name by 9 months
- No babbling, pointing, or waving by 12 months
- Unusual reactions to sensory input (e.g., no startle at loud sounds or extreme distress at routine noises)
Signs in Toddlers (1 – 3 Years)
- Delayed or absent spoken words (no single words by 16 months)
- Phrases lost after previously acquired
- Repetitive motions (hand‑flapping, rocking)
- Strong need for routines; extreme distress at small changes
- Fixated interests (e.g., spinning wheels, lining up toys)
Indicators in Preschoolers (3 – 5 Years)
- Difficulty initiating or sustaining play with peers
- Literal understanding of language; trouble with sarcasm or make‑believe
- Preference for solitary activities
- Intense, niche interests (e.g., dinosaurs, train schedules)
- Persistent echolalia (repeating phrases verbatim)
Watch for Regression
Roughly 20% of autistic children experience a loss of previously mastered words or social skills between 15 and 30 months. If regression occurs, seek a diagnostic evaluation right away.
Sensory Differences to Notice
- Extreme sensitivities to textures, lights, or sounds
- Unusual fascination with spinning objects or lights
- Either very high or very low pain tolerance
When to Seek a Professional Evaluation
If you notice two or more red flags above, consult your pediatrician. You can also review our guide on who can diagnose autism and our 2025 autism testing FAQ to prepare.
Early Intervention & Support Options (2025)
Evidence‑based therapies—ABA, speech‑language therapy, and occupational therapy—yield the best outcomes when started by age 3. Explore our detailed breakdown of parent‑focused treatment options for practical steps.
Quick FAQ (2025)
Is autism the same as ADHD?
No. While some traits overlap, ASD involves differences in social communication and restricted interests. Learn how to tell them apart in our article on autism vs. ADHD.
Does vaccination cause autism?
No credible scientific evidence supports a causal link between vaccines and autism. Multiple large‑scale studies confirm vaccine safety.
What are the latest prevalence numbers?
The CDC’s 2025 ADDM Network report puts U.S. prevalence at 1 in 31 eight‑year‑olds.
AQ section about Signs of Autism in Children:
What is autism?
Autism is a developmental disorder that affects communication and behavior. People with autism may struggle with social interaction, communication, and repetitive behaviors.
What are the signs of autism in children?
The signs of autism can vary from child to child, but some common signs include:
- Difficulty with social interaction, such as making eye contact, starting or maintaining conversations, or understanding facial expressions and other social cues
- Difficulty with communication, such as delayed speech or language development, or difficulty understanding or using spoken language
- Repetitive behaviors, such as hand flapping, rocking, or spinning
- Restricted interests, such as a strong interest in a particular topic or activity
- Sensory sensitivities, such as being oversensitive to noise, light, or touch
When should I be concerned about my child’s development?
Talk to your pediatrician if you are concerned about your child’s development. Your pediatrician can assess your child’s development and make referrals to other specialists if needed.
What should I do if I think my child may have autism?
If you think your child may have autism, the first step is to talk to your pediatrician. Your pediatrician can refer you to a specialist for further evaluation.
What are the treatments for autism?
There is no one-size-fits-all treatment for autism. Treatment plans are typically individualized based on the child’s specific needs. Some common treatments for autism include:
- Early intervention: Early intervention services can help children with autism develop the skills they need to communicate, interact with others, and learn.
- Applied behavior analysis (ABA): ABA is a therapy that can help children with autism learn new skills and reduce challenging behaviors.
- Speech therapy: Speech therapy can help children with autism develop their speech and language skills.
- Occupational therapy: Occupational therapy can help children with autism develop the skills they need to perform everyday activities, such as dressing and eating.
How can I support my child with autism?
There are many things you can do to support your child with autism. Some tips include:
- Learn as much as you can about autism. The more you know about autism, the better equipped you will be to support your child.
- Create a supportive environment at home. This may involve changing your home or routine to accommodate your child’s needs.
- Get involved in your child’s education. Work with your child’s teachers to develop an education plan that meets your child’s needs.
- Connect with other families of children with autism. Support groups and online communities can provide you with support and advice from other parents.
If you have any other questions or concerns about autism, please talk to your pediatrician or other healthcare provider.
Social & Communication Red Flags