Autism spectrum disorder (ASD) is a developmental condition that affects how a child communicates, relates to other people and experiences the world. Every autistic child is different. Some speak late or not at all and need support in daily life, others talk early and do well in school but find friendships and change difficult. What helps nearly all of them is the same: early recognition, practical support and families who understand their child’s strengths and needs. This guide explains the early signs, how autism is diagnosed, which services are available in the US and which therapies have evidence behind them.
Key points
- The CDC’s 2025 report found that about 1 in 31 eight-year-olds had been identified with autism in 2022; boys were about 3.4 times more likely than girls.
- The American Academy of Pediatrics recommends autism screening at the 18- and 24-month checkups.
- Autism can often be diagnosed reliably by age 2.
- Children under 3 can get free evaluations and early intervention through IDEA Part C; from age 3, schools provide services.
- Therapies focus on communication, social skills, daily living and behavior; medicine can help with severe irritability.
How common autism is
The CDC’s Autism and Developmental Disabilities Monitoring (ADDM) Network tracks autism among 8-year-olds in communities across the US. Its 2025 report, based on 2022 data, found that about 1 in 31 children had been identified with autism. Boys were identified about 3.4 times as often as girls. The numbers have risen over two decades, largely because of wider diagnostic criteria, better screening and more awareness. Autism occurs in all racial, ethnic and income groups.
Early signs to watch for
Signs often appear in the first two years. Talk to your child’s doctor if you notice:
- No response to their name by about 12 months
- Little eye contact or few shared smiles
- No pointing to show interest (for example at an airplane) by about 14 to 18 months
- Few or no gestures such as waving bye-bye
- Lost words or social skills the child already had, at any age
- Lining up toys, spinning objects or playing the same way again and again
- Repeating words or phrases (echolalia), flapping hands, rocking or spinning
- Strong reactions to sounds, textures, smells or lights, or unusual interest in them
- Great distress at small changes in routine
In older children, signs may include difficulty with back-and-forth conversation, trouble understanding jokes or unwritten social rules, very intense interests and preference for sameness. Girls are more often diagnosed later because they may mask difficulties by copying peers.
Screening and diagnosis
Screening
The AAP recommends developmental surveillance at every well-child visit and specific autism screening at 18 and 24 months, usually with the M-CHAT-R/F (Modified Checklist for Autism in Toddlers, Revised with Follow-Up). Parents answer 20 yes-or-no questions, and a follow-up interview clarifies concerning answers. A positive screen means a full evaluation is needed. It is not a diagnosis.
Diagnostic evaluation
A developmental-behavioral pediatrician, child psychologist, child psychiatrist or pediatric neurologist makes the diagnosis using the DSM-5-TR criteria. These require:
- Persistent difficulties in social communication and social interaction
- Restricted, repetitive patterns of behavior, interests or activities, including sensory differences
- Signs present from early childhood that cause significant challenges in daily life
Clinicians often use structured observation such as the ADOS-2 (Autism Diagnostic Observation Schedule) and a detailed parent interview. The diagnosis also notes the level of support needed (level 1, 2 or 3) and whether there is an intellectual or language impairment. Hearing tests, genetic testing (chromosomal microarray and fragile X testing) and screening for other conditions are often recommended. See also how mental illness in children is diagnosed.
Getting services in the US
| Age | Program | What it offers |
|---|---|---|
| Birth to 3 | Early Intervention, IDEA Part C | Free evaluation; services such as speech, developmental and occupational therapy, often at home, based on an Individualized Family Service Plan (IFSP) |
| 3 to 21 | Special education, IDEA Part B | Evaluation by the public school district; preschool and school services under an Individualized Education Program (IEP) |
| Any age | Medicaid and private insurance | Coverage of therapies such as ABA varies by state and plan; Medicaid covers medically necessary services for children under its EPSDT benefit |
Parents do not need a formal diagnosis or a doctor’s referral to contact their state’s early intervention program. Services can start while the evaluation is still underway.
Therapies with evidence
- Applied behavior analysis (ABA): breaks skills into small steps and uses positive reinforcement. Modern approaches are play-based and child-led rather than drill-based.
- Naturalistic developmental behavioral interventions such as the Early Start Denver Model (ESDM), developed by Sally Rogers and Geraldine Dawson, combine behavioral principles with play and everyday routines for toddlers and preschoolers.
- Speech and language therapy: builds spoken language and, when needed, alternative communication such as picture systems or speech-generating devices.
- Occupational therapy: works on fine motor skills, self-care and sensory needs.
- Social skills groups and parent coaching: help school-age children with conversation, play and friendships, and help parents use strategies at home.
Be cautious about treatments that promise a cure, such as chelation, special diets without a medical reason or unproven supplements. Some are expensive, and some are harmful.
Medication
No medicine treats the core features of autism. Medicines can help with related problems. Risperidone (from age 5) and aripiprazole (from age 6) are FDA-approved to treat irritability in autistic children, including severe tantrums, aggression and self-injury. Both can cause weight gain and need regular monitoring. ADHD, anxiety and sleep problems, which are common in autistic children, may also be treated. Learn more about ADHD and anxiety in children.
Everyday tips for families
- Use visual schedules with pictures for routines such as getting dressed or going to the doctor.
- Prepare for changes by talking about them in advance and using countdowns (“5 more minutes, then bath”).
- Sleep: keep a calm, predictable bedtime routine, a dark, quiet room and no screens in the hour before bed. Ask the doctor about persistent sleep problems.
- Feeding: many autistic children eat only a few foods. Offer new foods next to familiar ones without pressure, and ask about feeding therapy if the diet is very limited or weight is a concern.
- Build on strengths and interests to teach new skills and connect with your child.
- Look after yourself: parent support groups and respite care can make a big difference.
Frequently Asked Questions
Do vaccines cause autism?
Large studies of millions of children have found no link between vaccines and autism. The American Academy of Pediatrics continues to recommend routine childhood vaccination.
Can autism be diagnosed in toddlers?
Yes. An experienced clinician can often make a reliable diagnosis by age 2, and early intervention can start even sooner.
Will my child be able to talk?
Many autistic children who speak late develop useful spoken language, especially with early therapy. Others communicate well with pictures, signs or devices.
Is autism lifelong?
Autism is a lifelong difference in development, but skills and independence can grow a great deal with support through childhood and adolescence.
This article is general information and does not replace an evaluation by a pediatrician or a licensed professional.
