Is My Child Autistic? Early Signs in Toddlers (1–3 Years)

If you're reading this, you've probably noticed something — a behavior, a milestone delay, a quietness — that's making you wonder. You are not overreacting. Trusting your instincts and asking questions early is one of the most important things you can do as a parent.

This is a plain-English guide to what early signs of autism look like in toddlers, what's normal variation, and exactly what to do if you have concerns.

A note before we start

Autism is a spectrum. No two children present exactly the same way. The signs below are common patterns, not a diagnostic checklist. Only a qualified clinician can diagnose autism — but the earlier you raise concerns with your pediatrician, the better the outcomes for your child.

Common early signs by age

Around 12 months

• Doesn't respond consistently to their own name being called
• Limited eye contact during play or feeding
• Doesn't point at things to share interest ("Look, mom, a dog!")
• Doesn't wave bye-bye or imitate simple gestures
• Seems content to play alone for unusually long stretches

Around 18 months

• Few or no spoken words
• Doesn't pretend play (e.g., feeding a doll, talking on a toy phone)
• Repetitive movements like hand-flapping, rocking, or spinning
• Strong reactions to certain sounds, textures, or lights
• Lines up toys instead of playing with them

Around 24 months

• Doesn't combine two words ("more juice", "go car")
• Loses words or skills they previously had
• Avoids or doesn't engage in back-and-forth play
• Intense focus on parts of objects (spinning wheels, doors opening)
• Difficulty with transitions or changes in routine

Around 36 months

• Conversations are limited or scripted
• Difficulty playing with peers their age
• Strong attachment to specific objects or routines
• Limited interest in pretend or imaginative play
• Sensory sensitivities (covering ears, refusing certain foods)

What's NOT a sign of autism

It's just as important to know what's normal toddler behavior. The following are not by themselves indicators of autism:

• Tantrums or meltdowns when tired or hungry
• Going through a "shy phase" with strangers
• Preferring one parent over another
• Being a picky eater
• Talking late while showing strong understanding and engagement

If your child is socially engaged, makes good eye contact, and seems curious about people — even if they're a little behind on speech — that's typically normal variation.

When to talk to your pediatrician

You don't need to wait. If you notice multiple signs from the lists above, or if your gut is telling you something is off, ask your pediatrician for a developmental screening at your child's next visit.

The American Academy of Pediatrics recommends autism screening at the 18-month and 24-month well-child visits. If your pediatrician hasn't offered one, you can request it directly.

Common screening tools include:

• M-CHAT-R (Modified Checklist for Autism in Toddlers, Revised) — a parent questionnaire
• ASQ-3 (Ages and Stages Questionnaire) — broader developmental screen
• Direct observation by your pediatrician

If the screening flags any concerns, your pediatrician will refer you for a full evaluation — usually with a developmental pediatrician, child psychologist, or BCBA who specializes in autism diagnosis.

What happens after a referral

A formal autism evaluation typically includes:

1. Parent interview — your observations about your child's development
2. Standardized assessments like the ADOS-2 or ADI-R
3. Direct observation of your child playing and interacting
4. Review of medical and developmental records

The full process can take 2–4 hours. You'll receive a written report explaining the findings and recommendations.

Why early matters

Children diagnosed and supported before age 5 consistently show the most significant gains in communication, social skills, and adaptive behavior. The brain is most plastic during the early years — meaning evidence-based therapy like ABA can produce changes that last a lifetime.

This isn't about labeling your child. It's about giving them the tools they need to thrive — as early as possible.

What to do today

If you have concerns:

1. Write down specific behaviors you've noticed and when they started
2. Schedule an appointment with your pediatrician — bring your notes
3. Ask specifically for a developmental screening
4. If a referral is made, schedule the evaluation as soon as possible

You don't have to figure this out alone. If you're in Central Florida and want to talk through your concerns or schedule an autism evaluation, our BCBA team offers free consultations — no commitment, no pressure.

Trust your instincts. You know your child best.