Speech Delay or Autism? How They Differ and When to Get Help

A speech delay means a child is late to start talking or to say words clearly, and it can have many causes. Autism is a difference in how a child develops socially and communicates, with or without words, often with repetitive behaviors or very strong interests. A speech delay is about words; autism is about connection. So what doctors look at to tell the two apart is mostly not how many words a child says, but things like pointing, responding to their name and sharing interest with you.

A child can have both, and only an evaluation can tell which it is. You can ask for one now. Talk to your pediatrician, or, for a child under 3, call your state’s early intervention program yourself. As the Centers for Disease Control and Prevention puts it, “You do not need to wait for a doctor’s referral or a medical diagnosis to make this call” (CDC).

What is the difference between a speech delay and autism?

A speech delay is when a child starts talking later than most children, or is harder to understand than most children their age. Speech is how words are said, and language is what is understood and said, the words and sentences themselves; a “speech delay” in everyday use often means either. The American Academy of Pediatrics (AAP) lists hearing loss, a delay in other areas of development, and autism among the things a language delay can be a sign of. A child who is hard to understand may be using sound patterns that have usual ages, which the phonological processes chart lists.

Autism spectrum disorder is a developmental disability. The Centers for Disease Control and Prevention (CDC) describes it this way: “People with ASD often have problems with social communication and interaction, and restricted or repetitive behaviors or interests.” Autism affects how a child connects with other people, whether or not the child talks.

The two get confused because delayed language is also one of autism’s characteristics: CDC lists “Delayed language skills” among them. So a child who is not talking much could have a speech delay, could be autistic, or could be both. The American Speech-Language-Hearing Association (ASHA) draws the line clinicians use: “Speech difficulties are not the same as language and social communication problems.”

What doctors look at to tell a speech delay from autism

When a child is late talking, the signs doctors look at for autism are mostly not about words. ASHA’s Practice Portal on autism names what screening looks at to set autism apart from other developmental differences: “eye gaze, orienting to one’s name, pointing to or showing objects of interest, pretend play, imitation, nonverbal communication, and language development.”

CDC’s list of autism’s social communication signs runs by age. These are signs of autism only; CDC publishes no list of signs that a child has “only” a speech delay, and neither does this page.

By this age	What CDC lists
9 months	Does not respond to their name
9 months	Does not show facial expressions such as happy, sad, angry and surprised
12 months	Does not play simple interactive games like pat-a-cake
12 months	Uses few or no gestures, for example does not wave goodbye
15 months	Does not share interests with others
18 months	Does not point to show you something interesting
24 months	Does not notice when others are hurt or upset
36 months	Does not notice other children and join them in play

CDC adds, beside its own list: “It is important to note that children with ASD may not have all or any of the behaviors listed as examples here” (CDC). The list describes what doctors ask about. It is not a test, and no number of rows adds up to an answer.

CDC also lists repetitive behaviors, such as lining up toys and getting upset when the order is changed, getting upset by minor changes, and flapping hands, rocking or spinning. The AAP (HealthyChildren.org) gives an example of the difference in pointing: “Most children can point to out-of-reach objects that they want. A child on the autism spectrum may instead take a parent’s hand and lead the parent to the object without making much, if any, eye contact.”

Whatever you notice, write it down and tell the doctor alongside the words your child says. How your child points, waves, plays and responds to you is what helps a doctor see the whole picture. A single speech pattern on its own, such as leaving off the first sound of words, is not a sign of autism.

If your child loses words or skills they used to have, at any age, tell the doctor promptly. The AAP reports that “About 25% of children later diagnosed with autism may develop some language that they suddenly or gradually stop using,” usually between 15 and 24 months. Its page on language delays (AAP) says the same: tell the doctor if a child “stops talking or doing things that he or she used to do.”

Can a child have both a speech delay and autism?

Yes, a child can have a speech delay and be autistic. Delayed language is one of the characteristics CDC lists for autism, so for many autistic children the two come together.

The overlap does not run only one way. ASHA’s Practice Portal on late talkers says a late start to talking “may evolve into other disabilities, such as social communication disorder, autism spectrum disorder”, and in the same portal reports that “Approximately 50%–70% of children with LLE are reported to catch up to peers” by late preschool and school age. Most late talkers are not autistic, and some are. When a German team assessed 100 late-talking 2-year-olds, 4 met the criteria for autism, and the same team concluded that “a general ‘wait and see’ approach is not justified” (Buschmann and colleagues, 2008).

Autistic children also talk in very different ways. The National Institute on Deafness and Other Communication Disorders (NIDCD) notes that “Some children with ASD may not be able to communicate using speech or language, and some may have very limited speaking skills,” while “Others may have rich vocabularies and be able to talk about specific subjects in great detail.”

Among 8-year-olds in 2022, about 1 in 31 had been identified with autism, according to a 2025 surveillance report from the CDC. ASHA says that all people with an autism diagnosis are eligible for speech-language services, whatever their speech.

Is repeating words (echolalia) a sign of autism?

Echolalia means repeating words or phrases a child has heard, and on its own it is not a diagnosis. NIDCD describes two kinds: in immediate echolalia “the child repeats words someone has just said”, and in delayed echolalia “the child repeats words heard at an earlier time.”

Repeating is part of learning to talk. The AAP explains: “Most young children go through a phase when they repeat what they hear. Children on the autism spectrum may repeat what they hear for a longer period. They also may repeat dialogue from movies or conversations with the tone of voice they heard them in.” CDC lists repeating words or phrases over and over among autism’s repetitive behaviors.

So echoing that lasts, or whole lines from shows repeated in the same voice, is worth mentioning to the doctor alongside how your child points, plays and responds to you. It is one piece of the picture, never the whole of it.

When should I get my child evaluated?

Get your child evaluated as soon as you are worried, whatever the worry is. CDC’s advice to parents is “Don’t wait”, and it says that “Acting early on developmental concerns can make a real difference for your child and you” (CDC). A parent’s worry is reason enough to ask.

The AAP recommends that pediatricians check every child. CDC’s page on autism screening gives the AAP schedule: a developmental screening at 9, 18 and 30 months, and an autism screening at 18 and 24 months. If your child missed one of those checkups, or you are worried between them, ask for a screening.

Ask for an evaluation promptly if:

• your child is not talking much and you have also noticed any of the signs CDC lists, such as not pointing, not responding to their name or not sharing interest with you;
• your child has lost words or skills they used to have, at any age;
• your child is late to talk and nothing else worries you. A late talker is worth an evaluation for different reasons, starting with a hearing test.

Ages on CDC’s list are guides for when to ask, not deadlines. Support exists for a speech delay and for autism alike, and it can start as soon as you ask.

How to get a speech or autism evaluation, and what happens

For a child under 3 in the United States, the fastest route is to call your state’s early intervention program yourself. CDC’s early intervention page says “A doctor’s referral is not necessary,” and “These publicly funded programs provide services for free or at reduced cost for any child who is eligible.” CDC also keeps a state-by-state directory of the programs, with their phone numbers.

1. 1

   Under 3: call early intervention

   Call your state's early intervention program and say you are worried about your child's development and would like an evaluation. You do not need a doctor's referral or a diagnosis to make the call, and publicly funded programs provide services for free or at reduced cost for any child who is eligible.

2. 2

   3 or older: call a local public elementary school

   Call any local public elementary school, even if your child does not go to school there, and ask for an evaluation of your child's development.

3. 3

   Ask your pediatrician at the same time

   Ask for a developmental and autism screening and a hearing test. The pediatrician may refer your child to specialists, including a speech-language pathologist, for a fuller evaluation.

4. 4

   Bring notes

   Write down the words your child says and understands, how your child points, waves or shows you things, how they respond to their name, when you first noticed, any words or skills they have lost, any ear infections, and any family history of speech, language or developmental differences.

A screening is not a diagnosis. A screening is a short questionnaire; the one CDC names for toddlers is the Modified Checklist for Autism in Toddlers (M-CHAT). CDC’s guidance for clinicians is plain: “Screening tools do not provide conclusive evidence of developmental delays and do not result in diagnoses. A positive screening result should be followed by a thorough assessment.”

A full evaluation is done by one or more specialists, which CDC lists as a “developmental pediatrician, child psychologist, speech-language pathologist, and/or occupational therapist.” ASHA says that, ideally, the speech-language pathologist “is a key member of an interdisciplinary team with expertise in diagnosing ASD.” The AAP adds that a pediatrician may “Order a hearing test and refer you to a speech and language therapist for testing.” CDC notes that “By age 2, a diagnosis by an experienced professional can be considered reliable.”

Speech support does not have to wait for an autism diagnosis. CDC says that “Eligibility for early intervention services is based on an evaluation of your child’s skills and abilities”, so the program’s own evaluation decides what help your child gets. To find a certified speech-language pathologist privately, use ASHA ProFind.

Autism itself, from what causes it to which therapies suit a child, is a question for the evaluation team and your pediatrician, who know your child.

How to support your child’s talking while you wait

Talking with your child every day helps, whatever an evaluation finds. CDC’s milestone pages for 1-year-olds and 18-month-olds suggest three habits:

• Talk about what you are doing. “Talk or sing to your baby about what you’re doing,” such as “Mommy is washing your hands.”
• Respond to every way your child communicates. CDC says to “Respond with words when your baby points,” and to build on what your child tries to say: if they say “ta”, say “Yes, a truck.”
• Read and name pictures together. “Read books and talk about the pictures using simple words,” and add to the words your child says: “Yes, that’s a dog.”

If your child already sees a speech-language pathologist, follow their plan first. Keep each moment short and playful, and follow what your child is looking at.