Early Signs of Autism in Toddlers: A Parent's Guide to What to Watch For

If you've found yourself Googling "signs of autism in toddlers" late at night, take a breath. You're not being paranoid, and you're not overreacting. You're being a thoughtful parent who trusts your instincts, and those instincts matter more than most people realize.

At Avant-Garde Behavioral Therapy in Davie, FL, we work with families across South Florida whose journeys started with exactly the same feeling: something feels a little different, but I can't quite name it. This guide is here to help you name it, or to help you rule it out. Either way, knowledge is the first step toward peace of mind.

Why Early Recognition Matters So Much

According to the CDC's most recent data released in April 2025, approximately 1 in 31 children in the United States is diagnosed with Autism Spectrum Disorder (ASD), up from 1 in 36 just a few years earlier. Yet the median age of diagnosis is still nearly four years old, meaning many children miss out on years of early intervention that could dramatically shape their development.

Research consistently shows that the earlier a child receives support, the greater the impact on communication, social skills, learning, and independence. The brain is remarkably adaptable in the first three years of life. Early intervention doesn't just help. It can be transformative.

That's why knowing the early signs matters, even if you ultimately learn everything is developing typically.

A Quick Note Before We Begin

Every child develops at their own pace. Missing one or two milestones doesn't automatically indicate autism, and hitting every milestone doesn't guarantee typical development in every area. Autism is called a "spectrum" for a reason. No two children present the same way. Some are highly verbal but struggle with social nuance; others are minimally verbal but excel visually.

Use this guide as a conversation starter with your pediatrician, not as a diagnostic tool. Only a qualified professional can evaluate your child for autism.

Early Signs by Age

The CDC updated its developmental milestones in 2022 to reflect skills that at least 75% of children reach by a given age. If your child isn't meeting these, it's worth a conversation with your pediatrician.

By 9 Months

  • Doesn't respond to their name when called
  • Rarely smiles at familiar people or in response to social interaction
  • Shows few facial expressions (little variation between happy, sad, surprised)
  • Doesn't engage in back and forth exchanges of sounds, smiles, or expressions
  • Doesn't follow your gaze when you look at something across the room

By 12 Months

  • Little or no babbling ("bababa," "mamama")
  • Doesn't use gestures like waving bye bye, pointing, or reaching to be picked up
  • Doesn't play simple social games like peek a boo or pat a cake
  • Doesn't respond to their own name
  • Doesn't share interest by holding up objects to show you

By 15 to 18 Months

  • Very few or no spoken words
  • Doesn't point to things to show interest (a huge developmental milestone called "joint attention")
  • Doesn't engage in simple pretend play, like feeding a doll or pretending to talk on the phone
  • Doesn't look at what you point to
  • Prefers to play alone consistently and doesn't seek interaction

By 24 Months

  • No meaningful two word phrases (not counting imitation or repetition)
  • Doesn't imitate actions or words
  • Loses skills they previously had, such as words, babbling, eye contact, or social engagement (this is called regression and warrants immediate evaluation)
  • Doesn't follow simple instructions
  • Doesn't notice or seem to care when others are hurt or upset

Signs That Can Appear at Any Age

Beyond age specific milestones, some patterns can show up across toddlerhood and are worth noticing:

Social and communication differences:

  • Avoiding or inconsistent eye contact
  • Preferring to be alone rather than with people
  • Difficulty understanding others' feelings or expressions
  • Not responding to smiles, waves, or other social cues
  • Delayed speech, or speaking in an unusual tone (flat, sing song, or robotic)
  • Echoing words or phrases (called echolalia) without using them to communicate

Behavioral patterns:

  • Repetitive movements like hand flapping, rocking, spinning in circles, or walking on tiptoes
  • Intense focus on parts of objects (spinning the wheels of a toy car instead of pushing it)
  • Lining up toys in specific patterns and becoming upset if they're moved
  • Extreme distress over small changes in routine
  • Fixation on a single topic, object, or activity to the exclusion of others

Sensory responses:

  • Strong reactions to certain sounds, textures, tastes, or lights
  • Seeming not to notice pain, temperature, or loud noises that would startle other children
  • Craving certain sensory input (spinning, jumping, pressure)
  • Being extremely picky with food based on texture or appearance

What Autism Doesn't Look Like

Because autism awareness has grown, so has misinformation. It's worth clearing up a few things:

  • Autism is not caused by parenting styles, screen time, or vaccines
  • Autistic children can absolutely form deep, loving bonds with family
  • Some autistic toddlers make good eye contact. The absence of one sign doesn't rule out autism, and its presence doesn't rule it in
  • Late talkers aren't automatically autistic; many are simply late talkers
  • Being shy, introverted, or independent isn't autism

The picture matters more than any single behavior. Autism is usually identified through a pattern of differences across social communication, behavior, and sensory processing, not one isolated trait.

Girls Are Often Missed

One critical point for parents of daughters: girls with autism are often diagnosed later than boys, or missed entirely. According to CDC 2025 data, boys are still diagnosed at 3.4 times the rate of girls, but that gap is narrowing as clinicians get better at recognizing how autism can present differently in girls.

Girls on the spectrum may:

  • "Mask" their differences by mimicking peers
  • Have intense interests that appear more socially acceptable (specific animals, book characters, celebrities)
  • Show more subtle social struggles that get labeled as shyness or anxiety
  • Have meltdowns primarily at home after "holding it together" all day

If you're the parent of a daughter and your gut is telling you something, don't let anyone dismiss you because "she doesn't seem autistic."

What to Do If You Notice These Signs

If several items on these lists sound familiar, here's what we recommend:

1. Write it down. Keep a simple log of behaviors, what you've observed, and when. Include videos if you can. This documentation will be invaluable to any professional who evaluates your child.

2. Talk to your pediatrician. The American Academy of Pediatrics recommends autism specific screenings at 18 and 24 months. Ask specifically for an autism screening rather than just describing your concerns. Many parents report being told to "wait and see," but current guidance strongly discourages that approach.

3. Request a developmental evaluation. In Florida, families can access early intervention services through the Early Steps program for children under three at no cost, regardless of insurance. For children over three, the local school district provides evaluations through the Child Find program.

4. Don't wait for a formal diagnosis to start supporting your child. Skill building, sensory support, and structured routines help every child, with or without a diagnosis.

How Early Intervention Changes the Trajectory

When a child begins Applied Behavior Analysis (ABA) therapy early, often between ages 2 and 5, the results can be extraordinary. ABA uses evidence based strategies to build communication, social, play, and daily living skills at a developmental pace that works for each individual child.

At Avant-Garde Behavioral Therapy, our BCBAs (Board Certified Behavior Analysts) design personalized programs that meet your child exactly where they are. We focus on skill building through play, natural teaching moments, and positive reinforcement, not rigid drills. And because we know children learn best when their families are part of the process, parent training is built into every program we offer.

Early intervention isn't about "fixing" your child. It's about giving them the tools to communicate, connect, and thrive on their own terms.

Trusting Your Instincts as a Parent

Here's something we tell every family who walks through our doors: you know your child better than anyone. If your pediatrician says "let's wait," but your gut is screaming that something needs attention, push for the evaluation. If your extended family says "boys are just slower to talk," but you've noticed patterns beyond speech, get a second opinion.

Nobody has ever regretted seeking an early evaluation for their child. Many parents have regretted waiting.

Local Support for South Florida Families

If you live in Davie, Weston, Plantation, Cooper City, or anywhere in Broward County, Avant-Garde Behavioral Therapy is here to help. We provide:

  • Behavioral assessments to identify your child's specific strengths and challenges
  • ABA therapy in home, clinic, and community settings
  • Parent training so you feel confident supporting your child every day
  • Social skills development and support for adjustment disorders and developmental disabilities

We accept most major insurance plans and can help walk you through the process of getting your child evaluated and started with services.

Ready to Talk?

If any part of this guide made you nod, wonder, or feel a little sick to your stomach, please reach out. A conversation costs nothing, and it might be the beginning of the answers you've been looking for.

Call us at (954) 708-1661 or request an appointment online.

Whether your child ends up needing services or not, you deserve to feel confident about their development. We're here to help you find that clarity, with compassion, expertise, and no judgment. Every child deserves the chance to grow into their fullest self, and every parent deserves to be heard.

You're already doing the most important thing: paying attention.

This blog post is intended for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your child's development.