Early Signs of Autism by Age: What Parents Can Look For

Introduction

Autism spectrum disorder (ASD) is common and increasingly recognized earlier in life. The CDC’s latest surveillance report (released May 27, 2025) estimates about 1 in 31 (3.2%) U.S. 8-year-olds meet criteria for ASD, with boys affected over three times as often as girls. The American Academy of Pediatrics (AAP) continues to recommend universal ASD screening at 18 and 24 months alongside routine developmental surveillance.

Why this matters now—especially for families in Redlands and the Inland Empire: earlier recognition opens doors to free early-intervention evaluations, school supports, and therapies that can begin before a formal diagnosis in many California programs.

What to Look For, Why It Happens, and How to Act—By Age

Key Terms

ASD (Autism Spectrum Disorder): A neurodevelopmental condition defined by differences in social communication and restricted/repetitive behaviors and/or sensory differences, present from early development.

Joint attention: The back-and-forth of looking/pointing to share interest (e.g., pointing to a plane so you’ll look).

Regression: Loss of skills a child had (e.g., fewer words or less eye contact than before).

Screening vs. diagnosis: Screening uses quick checklists to flag risk; diagnosis is a full evaluation by trained clinicians.

Ages 6–12 Months: The Earliest Clues

• Limited eye contact, fewer social smiles, or less interest in faces.
• Less back-and-forth vocal play (cooing/babbling) and reduced response to name.
• Subtle differences in attention to people vs. objects and early repetitive movements.
• These “red flags” can show up in late infancy in some children; research on infants at an elevated likelihood for ASD also documents early social-communication differences in this window.

Ages 12–18 Months

• Little to no pointing or showing to share interest (joint attention).
• Limited gestures (waving, nodding), and minimal imitation.
• Not responding consistently to name, few meaningful sounds/words.

These are core social-communication milestones emphasized in pediatric guidance and CDC checklists.

Ages 2–3 Years

• Delays in language or social reciprocity (back-and-forth conversation/play).
• Less interest in peers; repetitive play patterns; insistence on routines.
• Some children may lose words or social engagement they had before (regression).

What this means for parents: If you notice lack of pointing/showing by 12–15 months, few words by 16–18 months, or a loss of words/social skills at any time, act now—bring it up with your pediatrician and ask for ASD screening and a referral to Early Start. You don’t need to wait for a medical diagnosis to request a free developmental evaluation.

Expert Perspective

“Acting early is not about ‘labeling’—it’s about opening doors. When families raise concerns at 12–24 months, universal screening plus Early Start referrals help children access communication and developmental supports during the brain’s most flexible years.”

—Fady Boules, PMHNP-BC

A Composite Story

The following is an illustrative composite, not a real patient account.

Maya, a Redlands caregiver, noticed her 18-month-old no longer waved “bye-bye” and didn’t point to show things. Their pediatrician completed the M-CHAT-R/F and referred the family to Inland Regional Center. Within weeks, they had a free Early Start evaluation and began parent-coaching sessions—months before a formal diagnosis. Having a plan eased their worries, and their child began making more sounds.

How to Act Early (Step-by-Step)

1. Watch development monthly. Use CDC’s milestone checklists (English/Spanish) and note concerns.
2. Ask for screening. Request ASD screening at 18 and 24 months (or sooner if concerned).
3. Call Early Start (0–36 months). In the Inland Empire, contact Inland Regional Center Early Start Intake: Riverside County: (951) 890-4763. San Bernardino County: (909) 890-4711. (Anyone can refer, and evaluations are free.)
4. If your child is 3–5 years old, request a school district evaluation under IDEA Part B; California law requires the IEP meeting within 60 calendar days of your consent to the assessment plan.
5. Check hearing. Hearing differences can mimic speech delay; follow AAP/CDC hearing screening guidance and get an audiology evaluation if there are concerns.
6. Start supports—don’t wait. In CA Medi-Cal, medically necessary behavioral health treatment (BHT), including ABA-based care, for members under 21 is covered under EPSDT; referrals can begin even while evaluation is in progress.
7. Keep notes. Track behaviors, videos, and questions for your visit.

Myths vs. Facts

Myth	Fact
“Vaccines cause autism.”	No. Multiple large studies and decades of monitoring show no link between any vaccine (including MMR) and ASD; a Danish cohort of >650,000 children found no association.
“It’s best to wait—kids outgrow delays.”	Waiting can delay support. AAP recommends ASD screening at 18 and 24 months and earlier referral if concerns arise.
“Girls don’t get autism.”	Girls can be autistic. ASD is more than 3× more common in boys, but girls are often under-identified or present differently.
“Bilingual homes cause delays or autism.”	Bilingual exposure does not cause delays and may confer advantages; studies in autistic children show no added language risk.
“Screeners like M-CHAT aren’t accurate.”	When used with follow-up, pooled sensitivity was 0.83 and specificity was 0.94 in a 50-study meta-analysis.

Risks, Limitations, and Uncertainties

Not every sign means autism. Hearing loss, developmental language disorder, ADHD, anxiety, or environmental/language differences can look similar. That’s why full evaluation matters.

Evidence on specific early interventions varies. Parent-mediated and naturalistic developmental-behavioral interventions show benefits on social communication, with mixed effects across other domains; quality and effect sizes differ by program, setting, and dose.

Policy nuances. The USPSTF still states evidence is insufficient to recommend universal ASD screening in asymptomatic toddlers (2016; the topic is being updated), while the AAP endorses universal screening—your clinician should discuss both and tailor to your child.

Alternatives and Adjacent Options

Policy + Practice + Lived Experience

Early Start (0–3): Free statewide early-intervention evaluation/services through California DDS; in the Inland Empire, contact Inland Regional Center intake.

School services (3–5): Request a district assessment for an IEP; in California, evaluation/IEP should occur within 60 days of consent.

Health plan pathways: For Medi-Cal/IEHP families, medically necessary BHT (ABA-based care) and speech/OT may start with a referral before a formal ASD diagnosis.

While you wait: Speech-language therapy, parent-coaching models, and audiology testing; check out our guides: What to Expect at a Pediatric Autism Evaluation and Insurance & Costs: Behavioral Health in the Inland Empire.

Community supports: Local family resource centers, caregiver groups, and regional center workshops.

Frequently Asked Questions

Q1: What are the earliest signs at 12 months? Less eye contact, minimal pointing/showing, reduced response to name, and limited babbling warrant a chat with your pediatrician and an Early Start referral.

Q2: Do we need a diagnosis to get services in CA? No. Under Early Start, you can request a free evaluation without a prior diagnosis; medically necessary BHT under Medi-Cal may begin with a physician/psychologist referral.

Q3: Cost/coverage/access in the Inland Empire? Early Start is free. School services (3+) are free under IDEA. IEHP/Medi-Cal covers medically necessary BHT and therapies for members under 21. Private plans in CA must cover ASD behavioral treatment under SB 946.

Q4: Can bilingual homes cause delays or autism? No—bilingual exposure does not cause language delay or ASD; keep using your family language(s).

Q5: Is M-CHAT-R/F accurate for 18-month visits, or should I wait? Use it now at 18 and again at 24 months; pooled sensitivity/specificity are strong when the follow-up is used, and AAP endorses screening at both visits.

Key Takeaways

1. Know the signs by age and act early—especially lack of pointing/showing by 12–15 months or skill regression.
2. Screen at 18 & 24 months (AAP) and ask for a hearing check if there’s speech delay.
3. In Redlands/Inland Empire, call Inland Regional Center Early Start intake to start free evaluations.
4. Services don’t always require a diagnosis—Medi-Cal/IEHP can authorize medically necessary BHT with clinician referral.
5. Vaccines don’t cause autism—trust established evidence.
6. If you only remember one thing… Early concerns deserve immediate action—ask for screening and call Early Start today.

Update triggers: Watch for USPSTF screening guideline updates, new Cochrane/major meta-analyses on early interventions, and CDC prevalence updates.

References

1. Centers for Disease Control and Prevention (CDC). Data & Statistics on Autism Spectrum Disorder (2025). https://www.cdc.gov/autism/data-research/index.html
2. American Academy of Pediatrics (AAP). Autism—Screening & Resources (2025). https://www.aap.org/en/patient-care/autism/
3. CDC. Clinical Testing and Diagnosis for ASD (DSM-5/DSM-5-TR criteria summary) (2025). https://www.cdc.gov/autism/hcp/diagnosis/index.html
4. CDC. Learn the Signs. Act Early—Milestones (2022). https://www.cdc.gov/act-early/milestones/index.html
5. Annual Review of Developmental Psychology. Early Social-Communication Differences in At-Risk Infants (2023). https://www.annualreviews.org/content/journals/10.1146/annurev-devpsych-120621-042753
6. AAP HealthyChildren. How Health Care Professionals Assess Autism Spectrum Disorder (2025). https://www.healthychildren.org/English/health-issues/conditions/Autism/Pages/How-Doctors-Screen-for-Autism.aspx
7. Wieckowski AT et al. Sensitivity and Specificity of M-CHAT(-R/F): Systematic Review & Meta-analysis. JAMA Pediatrics (2023). https://jamanetwork.com/journals/jamapediatrics/fullarticle/2801663
8. CDC. Accessing Services—Don’t Wait. Act Early! (2025). https://www.cdc.gov/autism/treatment/accessing-services.html
9. California Department of Developmental Services. Early Start (2025). https://www.dds.ca.gov/services/early-start/
10. Inland Regional Center. Eligibility & Early Start Intake (2025). https://www.inlandrc.org/eligibility/
11. California Education Code §56043. Special Education Timelines (accessed 2024). https://codes.findlaw.com/ca/education-code/edc-sect-56043/
12. AAP. Hearing Assessment in Infants and Children (2023). https://publications.aap.org/pediatrics/article/152/3/e2023063288/193755/Hearing-Assessment-in-Infants-Children-and
13. CDC. Hearing Loss Screening (2024/2025). https://www.cdc.gov/hearing-loss-children/screening/index.html
14. Department of Health Care Services (DHCS). Behavioral Health Treatment (BHT) Manual—Medi-Cal (updated 2025). https://mcweb.apps.prd.cammis.medi-cal.ca.gov/file/manual?fn=bht.pdf
15. Inland Empire Health Plan (IEHP). Autism Awareness—Access to BHT while evaluation proceeds (2022). https://www.iehp.org/en/our-organization/newsroom/newsroom-archive/2022/iehp-promotes-autism-awareness
16. CDC. Autism & Vaccines—Evidence Summary (2024). https://www.cdc.gov/vaccine-safety/about/autism.html
17. Hviid A et al. MMR Vaccination and Autism—Nationwide Cohort. Ann Intern Med (2019). https://www.acpjournals.org/doi/10.7326/M18-2101
18. Frontiers in Psychology. Bilingualism & ASD: No added language risk (2021). https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2021.741182/full
19. PubMed. Bilingualism and language in children with ASD (2024). https://pubmed.ncbi.nlm.nih.gov/38065434/
20. Whitehouse AJO et al. Preemptive parent-mediated intervention in at-risk infants: RCT. JAMA Pediatrics (2021). https://jamanetwork.com/journals/jamapediatrics/fullarticle/2784066
21. USPSTF. Autism Spectrum Disorder in Young Children: Screening (2016/active topic). https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/autism-spectrum-disorder-in-young-children-screening
22. 988 Suicide & Crisis Lifeline (2025). https://988lifeline.org/
23. RUHS Behavioral Health. Crisis Support System of Care—951-686-HELP (2024). https://ruhealth.org/behavioral-health/crisis-support-system-care
24. San Bernardino County DBH. Access/Crisis Lines (2025). https://wp.sbcounty.gov/dbh/
25. California Department of Insurance. Autism Coverage Requirements (2025). https://www.insurance.ca.gov/01-consumers/110-health/60-resources/05-autism/
26. AAP HealthyChildren. 7 Myths & Facts About Bilingual Children Learning Language (2024). https://www.healthychildren.org/English/ages-stages/gradeschool/school/Pages/7-Myths-Facts-Bilingual-Children-Learning-Language.aspx

Disclaimer

If you’re ready to talk, our Redlands team serves the Inland Empire with compassionate, evidence-based mental health and psychiatric care. Call us—or NP Fady at 909-707-6261—to explore next steps.

This article is for information only and does not substitute for professional advice, diagnosis, or treatment.

If you or someone you know is in crisis

• Call 911 or go to your nearest emergency room for any life-threatening emergency.
• 988 Suicide & Crisis Lifeline — call or text 988, available 24/7. En español: marque 988 y oprima 2. Veterans: 988 y oprima 1, or text 838255.
• Crisis Text Line — text HOME to 741741.
• The Trevor Project (crisis support for LGBTQ+ young people) — call 1-866-488-7386, or text START to 678-678.
• Riverside County — 24/7 crisis line 951-686-HELP (4357); CARES line 800-499-3008.
• San Bernardino County — DBH Screening/Referral 800-968-2636; DBH ACCESS 888-743-1478 (24/7); Mobile Crisis/CCRT 800-398-0018; crisis text 909-420-0560. Arrowhead Regional Medical Center (ARMC) has a dedicated adolescent psychiatric ER (ages 13–17).
• NP Fady (non-emergency) — for routine scheduling or questions, call (909) 707-6261. This line is not monitored for emergencies.