Last updated 2026-07-09
TL;DR
About 1 in 5 children has a speech or language delay: hitting milestones later than expected, for reasons that range from hearing loss to developmental differences to autism. Most delays respond well to early speech therapy. Call your pediatrician if your child isn't babbling by 12 months, saying single words by 16 months, or putting two words together by 24 months.
What counts as delayed speech in toddlers?
A speech delay means a child's spoken language is developing more slowly than what's typical for their age, and not in some minor, hard-to-notice way. It's measurably behind the milestones that speech-language pathologists and pediatricians use as reference points.
Two terms get mixed up constantly, even by providers, so it's worth separating them. Speech is the physical act of producing sounds and words. Language is the broader system of understanding and expressing meaning: words, sentences, gestures, comprehension. A child can have a speech delay (unclear articulation, limited words), a language delay (poor understanding, trouble forming sentences), or both. Which one is involved changes the treatment path.
The American Speech-Language-Hearing Association (ASHA) describes a language delay as occurring when a child's language skills fall below those of other children the same age [1]. That sounds circular, but in practice it's simple: there are published milestone ranges, and a child who consistently falls below the lower end of those ranges has a delay worth evaluating.
Somewhere between 15 and 20 percent of 2-year-olds show some form of speech or language delay, which makes it one of the most common developmental concerns parents raise at pediatric appointments [2]. Most of those children aren't autistic. Some are late bloomers who catch up on their own. Others need targeted therapy. A smaller number have an underlying condition the delay is pointing toward. Early evaluation exists to sort out which category a child is in before the window for easy intervention starts closing.
What are the typical speech milestones by age?
Milestones are ranges, not deadlines. A child who says her first word at 13 months isn't behind. But knowing the ranges gives you something concrete to compare against, which matters because well-child visits are short and it's easy to walk out feeling reassured when you shouldn't.
The CDC and AAP both publish milestone checklists, and in 2022 the AAP updated its developmental surveillance guidelines to recommend the CDC's updated milestone checklist as a standard tool at every well-child visit [3].
| Age | Typical speech and language benchmarks |
|---|---|
| 2 months | Coos, makes sounds in response to voices |
| 6 months | Babbles (ba, ma, da), laughs |
| 9 months | Varied babble, imitates some sounds |
| 12 months | 1-3 words beyond "mama/dada", points to objects |
| 15 months | 5-10 words, follows simple 1-step directions |
| 18 months | 10-25 words, points to show interest |
| 24 months | 50+ words, combining 2 words ("more milk", "daddy go") |
| 36 months | 200+ words, 3-word sentences, strangers understand ~75% of speech |
| 48 months | 1,000+ words, full sentences, tells short stories |
The 24-month mark gets the most clinical attention. A child who isn't combining two words by then should be evaluated, full stop. Research from the National Institute on Deafness and Other Communication Disorders (NIDCD) puts the typical first-word window at 11 to 14 months [4]. No words at all by 16 months, or losing words a child previously had at any age, are red flags that call for evaluation right away rather than a wait-and-see approach.
Word loss matters most of all. Regression, where a child who was saying words stops using them, is one of the clinical red flags specifically tied to autism spectrum disorder, showing up in roughly 20 to 30 percent of autistic children [5].
What are the signs of delayed speech in toddlers?
Parents usually notice something is off before a professional names it, and that instinct is worth trusting. The signs tend to cluster by age.
By 12 months, pay attention if your child isn't babbling with consonant sounds (ba, da, ga), isn't pointing or waving, and doesn't respond to their own name consistently. That last one, not responding to their name, is particularly worth flagging right away.
Between 12 and 18 months, watch for fewer than 5 meaningful words, no attempts to copy words or sounds you model, limited eye contact during communication, and no functional pointing (pointing to ask for something or show you something interesting). A child who isn't pointing to share interest by 14 months is showing something worth discussing with a pediatrician.
From 18 to 24 months, the flags include fewer than 50 words total, no two-word combinations, and being noticeably harder to understand than other kids the same age. Strangers should understand about half of what a typical 2-year-old says.
At any age, losing previously acquired speech or social skills is a red flag. If your child said "bye-bye" and "ball" and then stopped, don't wait for the next scheduled visit.
ASHA lists specific warning signs that should prompt a referral: no babbling by 12 months, no gesturing by 12 months, no single words by 16 months, no two-word spontaneous phrases by 24 months, or any loss of language or social skills at any age [1].
Comprehension is one thing parents sometimes miss. A child who seems to understand everything but doesn't talk much is in a different situation than a child who doesn't seem to follow directions or understand what's said to them. Both can be delays, but the second often points to a more significant language issue.
Is delayed speech a sign of autism?
This is usually the real question behind the search. The honest answer: sometimes, but often not.
Delayed speech is one of the most common early signs of autism spectrum disorder, but most children with a speech delay are not autistic. The Centers for Disease Control and Prevention estimates autism affects about 1 in 36 children in the United States, according to their 2023 surveillance report [6]. Speech delay affects roughly 1 in 5 toddlers. Those two numbers don't overlap neatly.
What tends to separate autism-related communication differences from other speech delays is whether social communication differences show up alongside the language issues. Autistic children often show delays in joint attention (looking at you to share interest in something), pointing, imitation, and responding to their name, along with differences in eye contact. A child with a speech delay who still makes strong eye contact, points often, and pulls your hand to show you things is showing a different profile than a child whose delay comes with limited social engagement.
That said, autism covers a wide spectrum and not every autistic child presents the same way. Some are socially engaged but have significant speech delays. Some have strong vocabularies but struggle with the social use of language. Diagnosis requires a full evaluation by a qualified team, not a checklist.
The AAP recommends universal autism screening at the 18-month and 24-month well-child visits using a validated tool, most commonly the M-CHAT-R/F [3]. A positive screen doesn't mean a child is autistic, only that further evaluation is warranted. If your pediatrician isn't doing this screening, ask for it directly.
For more on how delayed speech and autism overlap, our piece on autism spectrum speech therapy covers what communication looks like across the spectrum and which therapy approaches have the strongest evidence behind them.
Delayed speech vs. autism: what's actually different comes down mostly to social communication, not vocabulary size. There's no checklist that can settle this for your particular child, but clinicians do look at consistent patterns to tell one from the other. Children with a plain speech delay, no autism involved, tend to make steady eye contact and use it purposefully. They point to share something interesting, not just to request things. They imitate sounds and actions easily, seem genuinely drawn to other kids and to playing with adults, and usually understand language as well as or better than they can produce it. When words don't come, they lean hard on gestures and facial expressions to get the message across. Autistic children can show some of these same behaviors, particularly if they're more verbal or had early intervention. But the fuller cluster of social communication differences tends to stick around and looks different in kind, not just a matter of a child who hasn't caught up on words yet. There's also a difference in what's delayed and how. A child with a straightforward speech delay usually understands more than they can say. In autism, both expression and comprehension may lag, or you might see unusual patterns like memorized phrases (echolalia) that don't flex into new language. Echolalia, repeating words or phrases someone else said, shows up far more in autistic children than in kids with speech delays from other causes. It's worth knowing that some echolalia is completely normal around 18 to 24 months for any child. It becomes a more meaningful signal when it's still the main way a child communicates past age 3, or when it's delayed rather than immediate. Repetitive behaviors, narrow interests, sensory sensitivities, and a strong need for sameness round out the autism picture and don't appear in speech delay from other causes. An autism-specialized speech-language pathologist can often pick up on these patterns during an evaluation, which is one reason getting referred early matters. Our speech delay article goes deeper into how evaluation and therapy differ between the two. No single thing explains most speech delays; clinicians usually work through several possibilities. Hearing loss is the first to rule out, and it gets missed often. A child who isn't hearing sounds clearly can't learn to reproduce them accurately, and even mild or on-and-off hearing loss from repeated ear infections can slow things down. Any child being evaluated for a delay should get a full audiological evaluation, not just a pass/fail screening. Sometimes the issue is oral motor: the muscles used for speech aren't coordinating well. Childhood apraxia of speech (CAS) is a specific motor speech disorder where a child knows exactly what they want to say but their mouth won't reliably produce it. CAS isn't the same as a general delay and needs its own kind of therapy. Developmental language disorder (once called specific language impairment) is another possibility: language develops slowly with no identifiable cause like hearing loss or autism behind it. It's more common than people assume, affecting an estimated 7 to 8 percent of kindergartners [7]. One thing that does not cause speech delays is being raised bilingual. That myth causes real harm when families drop a home language because of it. Bilingual kids often split their words across two languages, so counting only their English vocabulary makes it look smaller than it is, but their total vocabulary matches monolingual peers. If a bilingual child has a genuine delay, it shows up in both languages, not just one. Prematurity, genetic conditions, neurological differences, and family history all play a role too. Kids born prematurely usually get evaluated against their corrected age rather than birth age, and conditions like autism, Down syndrome, and intellectual disability commonly come with speech and language delays built in. And sometimes there's simply no clear cause: a child develops language more slowly, catches up with or without therapy, and nothing ever explains why. That's genuinely common. The "late bloomer" idea can work against early intervention. It's true that some children who seem behind at 18 months catch up by 36 months with no therapy at all, and research backs that up. But nobody can reliably predict ahead of time which child will catch up on their own, and waiting has real costs. In the United States, early intervention services for children under 3 are federally mandated under Part C of IDEA [8]. They're free in most states, happen at home or in the community, and don't require a diagnosis, just a demonstrated delay, and a parent can refer their own child. The evidence consistently shows better outcomes for kids who start speech therapy earlier, since the brain's plasticity peaks in the first three years. Waiting until 3 or 4 to see if a child grows out of it means giving up part of that easiest window for learning language. If you're seeing any of the red flags mentioned above, call your pediatrician that same week rather than waiting for the next scheduled visit, and ask for both a speech-language pathologist referral and an audiology evaluation at once. Then contact your local early intervention program directly regardless of what the pediatrician says: you can self-refer, and that process moves in parallel with any medical referrals. The CDC keeps a state-by-state directory for finding your local program [9], and our piece on early intervention speech and language therapy walks through how Part C actually works. Diagnosing a speech delay happens in two stages: ongoing developmental surveillance by your pediatrician, and a formal evaluation by a speech-language pathologist. At well-child visits, pediatricians use screening tools like the ASQ (Ages and Stages Questionnaire) or the CSBS (Communication and Symbolic Behavior Scales) to flag kids who need a closer look. A flagged screen just means a full evaluation is needed, not that anything's been diagnosed. That full evaluation, done by a licensed SLP, usually includes standardized language testing, a check of speech sound production, an oral mechanism exam, a hearing screen (or a note that a formal audiology test is pending), and a conversation with parents about developmental history and communication at home. The SLP compares results to age norms and writes up a report. A child scoring below age expectations, typically 1.5 to 2 standard deviations under the mean, qualifies for services through early intervention, the school system, or a private provider depending on age. Under 3, that means your state's early intervention system under IDEA Part C; 3 and older, it shifts to the school district under Part B [8]. Private SLP care is also an option and often has shorter waits, though insurance coverage varies a lot. If autism is a possibility, a separate diagnostic evaluation is usually recommended, done by a psychologist, developmental pediatrician, or a team, and kept distinct from the speech evaluation, though the two can happen around the same time. For more on what to expect from a speech evaluation and working with an SLP, see speech therapy speech therapist.What does speech therapy for delayed speech actually look like?
It looks a lot like play, and that's not shorthand for informal. That's genuinely how good early language intervention works.
For late talkers and children with mild to moderate speech delays, therapists typically use naturalistic developmental behavioral interventions (NDBIs), which embed language targets into play. The therapist follows the child's lead, creates chances for the child to communicate, and models language just slightly above where the child currently is. Parents are usually in the room and often end up being the ones who carry the strategies home, which is where most of the real learning happens.
For children with autism, approaches like EIBI (Early Intensive Behavioral Intervention) and JASPER (Joint Attention, Symbolic Play, Engagement, and Regulation) have strong evidence behind them. JASPER in particular targets the joint attention and play skills that underpin language [10].
Motor speech disorders like apraxia call for a different, more drill-based approach. Dynamic Temporal and Tactile Cueing (DTTC) is one of the best-supported treatments for childhood apraxia of speech.
How often therapy happens varies a lot. Early intervention services under Part C are often provided once or twice a week. Private therapy ranges from weekly to daily depending on severity and what a family can access. But the research is clear that what happens between sessions matters as much as the sessions themselves, so a therapist who sends you home with nothing to practice is leaving progress on the table.
This is where a tool like Little Words fits in practically. Consistent daily language exposure between sessions is what actually moves the needle, and the app gives parents a structured way to practice at home using the same kinds of strategies SLPs rely on. For a wider view of what therapy involves across ages and needs, speech therapy for kids is a good place to start.
Can parents help at home?
Yes, and this might be the most useful thing in this whole piece. Parent-implemented strategies have strong research behind them. A 2018 Cochrane review found that parent-mediated interventions for young autistic children significantly improved language and communication outcomes [11], and the same principle holds for non-autistic children with speech delays. The strategies with the best evidence are also the simplest ones.
Follow your child's lead: talk about whatever they're looking at or reaching for, not whatever you'd rather they focus on. If they reach for a cup, say "cup" or "you want the cup." This is parallel talk, and it ties language directly to what's already got their attention.
When your child says one word, give them two back. They say "dog," you say "big dog" or "dog running." That keeps your language just a step ahead of theirs, which is where learning happens best.
Try cutting back on questions and leaning into comments instead. Parents naturally ask "what's that?" over and over, but questions put a child on the spot. A comment like "oh, a truck!" is a lower-pressure invitation to respond.
After you say something, pause for 5 to 10 seconds before jumping back in. Kids often need more processing time than adults instinctively give them, and filling the silence too soon cuts off the response before it forms. Reading together works best when it's interactive rather than a straight read-through: point to pictures, name them, wait for a response. For late talkers, that kind of interactive shared reading consistently beats passive reading in language studies.
None of this replaces a real evaluation or therapy. But it's available in every interaction you already have with your child, starting today.
When does a speech delay become a bigger concern?
Some delays resolve on their own. Others are a sign that more support is needed.
Pay closer attention if the delay persists past age 3 without meaningful progress, if skills seem to be going backward instead of forward, if comprehension is also delayed, if social communication differences are part of the picture, or if the child simply isn't responding to early intervention. Hearing loss that goes undetected has long-term effects on language, literacy, and school performance, so if a child hasn't had a formal hearing test from an audiologist, that should come before anything else.
Slow but steady progress in therapy is usually fine: language development isn't a straight line, and it takes time. But if six months go by with no meaningful change, it's worth revisiting the evaluation. Either the diagnosis missed something, the therapy approach isn't the right match, or the intensity needs to go up.
Language problems that stick around tend to show up later as reading problems. The National Institute on Deafness and Other Communication Disorders notes that speech and language delays in young children are among the most common risk factors for later reading difficulties [4]. That's not meant to alarm anyone, it just means that treating a speech delay early is also, in effect, treating a future reading risk early.
When a child is diagnosed with or suspected of having autism and communication challenges are significant, augmentative and alternative communication (AAC) tools may come up as an option, ranging from picture boards to speech-generating devices. Using AAC doesn't block speech from developing; research consistently shows it supports natural speech rather than replacing it. Our piece on alternative augmentative communication devices for autism goes into this in more depth, and if you're dealing with insurance or school paperwork, speech delay icd 10 walks through how the diagnostic coding works.
How much does speech therapy cost?
Cost is a real barrier for a lot of families, so it's worth laying out plainly.
For children under 3, early intervention services under Part C of IDEA are provided at no cost to families in most states [8]. A few states charge a small sliding-scale fee, but federal law requires that cost not stand in the way of access, and this benefit is underused: many families don't realize they can self-refer without a doctor's order. For children 3 and older, school-based speech therapy under IDEA Part B is also free if the child qualifies through the district's evaluation, and it's available to every eligible child regardless of whether they attend public school.
Families who go the private route, often for shorter wait times or more intensive services, typically pay $100 to $350 per session depending on location and the therapist's credentials, with sessions ranging from weekly to several times a week. Without insurance, annual out-of-pocket costs for private therapy can run $5,000 to $15,000 or more.
Insurance coverage varies a great deal by plan and state. Many states require plans to cover speech therapy for developmental conditions, but the details depend on the diagnosis code, the plan type, and state mandate laws. Medicaid usually covers speech therapy for children who qualify, though limits vary by state.
Online speech therapy has opened up access and lowered costs in recent years. Telehealth sessions usually run $50 to $150 and are increasingly covered by insurance. It's not the best fit for every child, especially very young toddlers, but for school-age kids and many preschoolers, the outcomes hold up well. Online speech therapy covers that option in more detail, and pediatric speech therapy has a broader cost breakdown and guidance on choosing a provider.
Hearing loss is usually the first thing clinicians rule out, since it's common and directly treatable. After that, the most frequent causes of speech delay are developmental language disorder (which has no single identifiable cause), autism spectrum disorder, oral motor differences, and prematurity, though often no clear cause turns up at all. Pairing a hearing test with a full speech-language evaluation gives you the clearest picture. There's no minimum age for seeing a speech therapist. If something worries you at 9 months, you can ask for an evaluation right then. ASHA's guidelines do flag specific points: no babbling by 12 months, no words by 16 months, no word combinations by 24 months. For kids under 3, your state's early intervention program will evaluate for free, so there's no reason to wait until age 3 to get started. Yes, a child can absolutely have a speech delay without being autistic, and this is actually the more common situation. Somewhere between 15 and 20 percent of toddlers show some kind of speech or language delay, while autism affects roughly 1 in 36 children, so most kids with delays aren't autistic at all. Hearing loss, developmental language disorder, childhood apraxia of speech, and prematurity are all common causes that have nothing to do with autism. A speech-language pathologist's evaluation is what actually clarifies which one you're dealing with. When a speech delay does turn out to be autism-related, certain signs tend to cluster together: not responding to their name by 12 months, not pointing to share interest by 14 months, limited or unusual eye contact, little imitation of sounds or actions, losing words or social skills they'd already gained, repetitive movements, or a strong pull toward specific routines. No single sign proves anything on its own. It's the pattern that matters, and only a formal evaluation can sort that out. Bilingualism doesn't cause speech delays. Bilingual kids hit language milestones on the same general timeline as monolingual kids; they might seem to have a smaller vocabulary in each individual language, but add both languages together and the total lines up with their peers. If a bilingual child has a real delay, it will show up in both languages, not just one, so there's never a good reason to tell a family to drop a home language for the sake of speech development. Speech delay and language delay get used interchangeably, but they're not the same thing. Speech delay is about the mechanics of talking: producing sounds, words, and phrases. Language delay is broader and can involve trouble understanding language, trouble expressing thoughts, or both. A child can have one without the other, though they frequently show up together, which is exactly why a thorough SLP evaluation checks both. Some late talkers do catch up on their own by age 3, especially the ones who are already progressing well in social communication and understanding. Studies estimate that 50 to 80 percent of late talkers identified at 24 months catch up without formal help, though the numbers shift depending on the study. The catch is that no one can reliably predict in advance which child will be in that group. Since early intervention carries little downside and real potential upside, most clinicians would rather you not wait and see. In the US, you don't need a doctor's referral to get a free evaluation through your state's early intervention program. Your pediatrician's office can give you the contact information, or you can just search "[your state] early intervention program" online. The evaluation itself is free, services under Part C of IDEA cost nothing in most states, and the whole process from initial request to completed evaluation usually takes 30 to 45 days. If your pediatrician suggests waiting and seeing, ask them directly which milestone worries them most and what would need to happen for them to change that advice. Then go ahead and self-refer to your state's early intervention program anyway, since you don't need their permission. The evaluation is free and there's no real downside to it: if your child doesn't qualify, you haven't lost anything, but if they do qualify and you'd spent six months waiting for a recheck, you've lost time you can't get back. The research on screen time and speech delay is observational and messy. The AAP recommends skipping screen-based media (other than video chatting) for kids under 18 to 24 months, largely because passive screen time crowds out the face-to-face interaction that actually builds language. No study has shown screens directly cause a speech delay, but heavy passive screen use does correlate with less language input and interaction, and those are the things that genuinely drive early language growth. Plenty of children with speech delays catch up completely, particularly when the delay is caught early and therapy starts right away. Kids with mild to moderate delays who get appropriate early intervention often reach age-level skills by kindergarten. Kids with more significant delays, an underlying condition like autism or childhood apraxia of speech, or a delay caught later in life tend to need support for longer. Full catch-up happens often, but how it plays out depends on severity, cause, and how early treatment starts. Therapy looks different depending on what's driving the delay. For autism-related communication differences, therapy usually focuses on social communication skills like joint attention, imitation, and turn-taking alongside language goals, and approaches like JASPER and EIBI have the strongest track record for autistic children. For speech delays without autism, naturalistic developmental approaches and coaching parents directly tend to be the go-to methods. Childhood apraxia of speech, which shows up with or without autism, needs motor-focused practice that looks quite different from standard language therapy.Sources
- American Speech-Language-Hearing Association (ASHA), Late Language Emergence Practice Portal: ASHA defines a language delay as occurring when a child's language skills are below those of other children the same age, and lists specific red flags including no words by 16 months and no two-word phrases by 24 months.
- American Academy of Pediatrics (AAP), Developmental Surveillance and Screening: Approximately 15 to 20 percent of children show some form of speech or language delay, making it among the most common developmental concerns.
- Centers for Disease Control and Prevention (CDC), Developmental Milestones: The CDC publishes updated developmental milestone checklists adopted by the AAP in 2022 for use at every well-child visit, including milestones for speech and language by age.
- National Institute on Deafness and Other Communication Disorders (NIDCD), Speech and Language: NIDCD states the typical first-word window is 11 to 14 months and notes that speech and language delays are among the most common risk factors for later reading difficulties.
- Journal of Child Psychology and Psychiatry, developmental regression in autism (PMC): Regression, including loss of previously acquired words, appears in approximately 20 to 30 percent of autistic children and is a recognized early clinical red flag.
- Centers for Disease Control and Prevention (CDC), Autism Data and Statistics: The CDC's 2023 ADDM surveillance report estimates autism affects approximately 1 in 36 children in the United States.
- NIDCD, Developmental Language Disorder: Developmental language disorder affects an estimated 7 to 8 percent of kindergartners, making it one of the most common childhood developmental conditions.
- U.S. Department of Education, Individuals with Disabilities Education Act (IDEA): Part C of IDEA mandates free early intervention services for children under 3 with developmental delays; Part B covers eligible children ages 3 and older through the school system.
- Centers for Disease Control and Prevention (CDC), Act Early state early intervention contacts: The CDC maintains a state-by-state directory of early intervention programs that families can contact to self-refer for free developmental evaluations.
- Journal of the American Academy of Child and Adolescent Psychiatry, JASPER trial (PMC): JASPER (Joint Attention, Symbolic Play, Engagement, and Regulation) has demonstrated significant improvements in joint attention and language outcomes for young autistic children in randomized controlled trials.
- Cochrane Database of Systematic Reviews, parent-mediated interventions for autism (2018): A 2018 Cochrane review found that parent-mediated interventions for young autistic children significantly improved child language and communication outcomes compared to control conditions.