Every toddler develops at their own pace. Some children talk late, some walk early, and many skip steps. Autism signs can be subtle, and parents often sense something before anyone else does. This guide lists the early signs clinicians look for, explains how screening works, and tells you what to do next.
The short answer: if you notice several of the signs below, talk with your pediatrician and ask for an autism screening. Do not wait for your child to “grow out of it.” Early support helps.
Early signs of autism by age
Autism usually shows up in how a child communicates, plays, and reacts to the world. The signs below are common. A child with autism may show some of them and not others.
Social communication
- Makes little or inconsistent eye contact.
- Does not respond to their name by about 12 months.
- Does not point, wave, or show you objects by about 18 months.
- Rarely smiles back or shares enjoyment with you.
- Shows little interest in other children.
- Does not look where you point.
Speech and language
- Does not babble by about 12 months.
- Does not say single words by about 16 months.
- Does not use two-word phrases on their own by about 24 months.
- Repeats words or phrases over and over. This is called echolalia.
- Loses words or social skills they once had. Loss of skills at any age needs prompt attention.
Play and behavior
- Lines up toys or objects instead of playing with them in varied ways.
- Plays with one part of a toy, such as spinning a wheel, again and again.
- Repeats movements such as hand flapping, rocking, or spinning.
- Becomes very upset by small changes in routine.
- Has intense interests in a narrow set of topics or objects.
Sensory differences
- Reacts strongly to sounds, textures, lights, or smells.
- Seeks out certain sensations, such as looking closely at spinning objects.
- Shows unusual reactions to pain or temperature.
Signs that look different in some children
Autism can look different from child to child. Some toddlers, including many girls, mask their difficulties or show quieter signs. A child may talk early and still struggle with back-and-forth interaction. If something feels off, trust that instinct and ask for an evaluation.
How autism screening works
Screening is a short check that flags children who may need a full evaluation. The American Academy of Pediatrics recommends autism-specific screening at 18 and 24 months, in addition to regular developmental checks. A common tool is the M-CHAT-R/F, a parent questionnaire designed for children 16 to 30 months old.
A screening result is not a diagnosis. A positive screen means your child should see a specialist, such as a developmental pediatrician or child psychologist, for a full evaluation. You can try our free autism screening tool at home and bring the results to your pediatrician.
What to do if you see signs
- Write down what you see. Note examples, when they happen, and how often. Short videos can help your doctor see what you see.
- Talk with your pediatrician. Share your notes and ask for an autism screening and a developmental evaluation.
- Ask about early intervention. In the United States, children under three may qualify for free evaluations through their state’s early intervention program. You do not need a diagnosis to ask.
- Look into therapy. If your child receives a diagnosis, early intervention ABA can start building communication, play, and daily living skills. Our guide to ABA therapy explains how it works.
Many families wait for a diagnosis before they act. You can ask about services and screening while you wait for an appointment. Waitlists for evaluations are often long, so the earlier you ask, the sooner your child can get support.
Frequently asked questions
Can a toddler be diagnosed with autism?
Yes. Clinicians can reliably diagnose autism in many children by age 2, and sometimes earlier. A diagnosis comes from a qualified clinician after a full evaluation.
Is late talking a sign of autism?
Late talking can have many causes. Late talking along with limited eye contact, pointing, or social interest is a reason to ask for a screening.
What is the difference between a screening and a diagnosis?
A screening is a quick questionnaire that flags concerns. A diagnosis comes from a clinician after a detailed evaluation and observation.
If my child shows signs, does that mean they have autism?
Not necessarily. Many of these signs also appear in other developmental conditions and in typical development. A screening and a full evaluation give you a clear answer.
Next step
If you have concerns about your toddler’s development, talk with your pediatrician this week. If your child already has a diagnosis, start with a free benefits check. Our team will explain what a first assessment looks like and answer your questions.
This article is for general education. It does not replace advice from your child’s doctor.
