
Last updated 2026-07-09
TL;DR
Roughly 1 in 5 children under age 5 shows a speech or language delay. The red flags: no babbling by 12 months, no single words by 16 months, no two-word phrases by 24 months, or any loss of language at any age. Earlier evaluation means better outcomes. Evaluation through your school district or state early intervention program costs nothing.
What counts as a speech delay, exactly?
A speech delay means a child's spoken language is developing well behind what's expected for their age. That's different from a speech disorder like a stutter or an articulation problem, though those can overlap. It's also different from a language delay, even though people use the terms as if they mean the same thing. Speech is the physical act of making sounds. Language is the whole system of understanding and expressing meaning: vocabulary, grammar, and comprehension.
Most parents land in a specialist's office for one of two reasons. Their child isn't talking as much as other kids the same age, or their child talked and then stopped. Both deserve to be taken seriously.
About 15 to 20 percent of 2-year-olds show some kind of speech or language delay, according to the American Speech-Language-Hearing Association [1]. Most of those kids catch up. But a real subset, somewhere around 20 to 30 percent of late talkers, go on to have language difficulties that stick around and respond to early therapy [2]. Here's the hard part. You can't tell by watching and waiting which group your child is in. That's the whole reason evaluation matters.
This article won't tell you whether your specific child has a delay. Only a licensed speech-language pathologist can do that. What it gives you is an honest map: what the milestones look like, what the red flags are, and what to do next.
What are the normal speech and language milestones by age?
Milestones are ranges, not due dates. A child who says a first word at 10 months and a child who says it at 14 months are both fine. What matters is the pattern across many milestones, not whether your kid hit one marker on the exact month.
Here's what the clinical consensus from ASHA and the American Academy of Pediatrics actually says [1][3]:
| Age | Speech and language expectations |
|---|---|
| 2 months | Cooing sounds; startles at loud noises |
| 4 months | Babbles with repeated syllables ("babababa"); laughs and squeals |
| 6 months | Responds to name; babbles with changing tones |
| 9 months | Imitates sounds; uses gestures like pointing and waving |
| 12 months | 1 to 3 words with meaning ("mama", "dada", "no"); jargon that sounds like real speech |
| 18 months | At least 10 words; follows simple one-step directions; points to familiar objects when named |
| 24 months | 50+ words; combines 2 words ("more milk", "daddy go"); strangers understand about 50% of speech |
| 36 months | 200+ words; 3 to 4 word sentences; strangers understand about 75% of speech |
| 4 years | 1,000+ words; tells simple stories; nearly all speech understood by strangers |
| 5 years | Full sentences; most speech sounds correct; can retell a story in sequence |
Those word counts come from large normative samples and sit around the 50th percentile, meaning half of kids that age have more words and half have fewer. A child at or below the 10th percentile is the point where a speech-language pathologist usually flags a concern [1].
Gestures get overlooked in these conversations. Pointing, waving, showing objects, reaching. All of them predict later language, and strongly. A 12-month-old who babbles plenty but doesn't point yet is worth watching closely.
What are the biggest red flags for speech delay?
Some signs are more urgent than others. These are the ones clinicians treat as reasons to refer right away, not wait until the next well visit [1][3]:
Any loss of skills at any age. A child who was saying words and stops, or was babbling and goes quiet, is showing regression. That's a red flag no matter their current age. Call the pediatrician that same week.
No babbling by 12 months. Babbling, that back-and-forth "bababa" and "dadada," is the scaffold real words get built on. Its absence at 12 months carries higher risk for later language difficulties and, in some cases, autism spectrum disorder [4].
No single words by 16 months. The AAP and ASHA both mark this as a referral point. A handful of typically developing children say a first word at 15 or 16 months. Not many. No meaningful words at all by then is not something to wave off.
No two-word phrases by 24 months. These are combinations the child makes up themselves, like "more cookie" or "go car." Repeating lines from a TV show or a book doesn't count the same way.
Hard to understand, even for family. By age 2, parents and caregivers should follow about half of what a child says. By age 3, strangers should catch around 75 percent. If parents understand less than a quarter of their 3-year-old, that's a concern.
Not responding to their own name by 12 months. This one overlaps with hearing problems and with social communication differences seen in autism. If it's the only flag, rule out a hearing issue first.
A couple of signs catch parents off guard. A child who talks a lot but mostly repeats lines from shows or books (called echolalia) without making up original language. And a child who has words but uses them on and off, or loses them under stress. Both patterns are worth raising with a specialist.
How is a speech delay different from a language delay?
The distinction matters because the treatment can differ. Speech is production: the sounds, the clarity, how words leave the mouth. A child with a pure speech delay might have a big vocabulary and understand everything you say, yet be hard to follow because of how they make sounds. Apraxia of speech is one example, a motor speech disorder where the brain struggles to coordinate the movements for talking. That's a speech problem, more than a language one.
Language is the bigger system: vocabulary, grammar, understanding, and the social use of communication (called pragmatics). A language delay means the child is behind on the content of what they say or understand, more than on how they say it.
Plenty of kids have both. A 2-year-old with 15 words (well under the 50-word norm) and unclear speech has a language delay and a speech delay together. An SLP checks both in the same evaluation.
Comprehension is the piece parents miss most. A child who understands everything but talks little is in a different spot than a child who doesn't follow directions or grasp questions. That second profile worries clinicians more, because understanding usually runs ahead of talking. When comprehension is also behind, the delay reaches wider and early help matters more [2].
Could it be autism? What's the overlap between speech delay and autism?
This is the question most parents are quietly asking without saying out loud. Speech and language differences are among the earliest signs of autism spectrum disorder, but the relationship runs both directions. Most kids with speech delays don't have autism. And plenty of autistic kids are quite verbal.
The CDC estimates about 1 in 36 children is diagnosed with autism spectrum disorder [5]. Speech delays show up in a large share of those kids, but a speech delay by itself is not an autism diagnosis. The features that point toward autism sit in social communication: reduced eye contact, limited joint attention (looking at something together with someone else), not pointing to share interest (which is different from pointing to request), little imitation of actions, and repetitive behaviors or restricted interests beyond what's typical.
A speech delay plus any of those social communication differences is the combination that warrants a specific autism evaluation, more than a speech evaluation alone. You can request one through your pediatrician, your state's early intervention program (if the child is under 3), or your school district's special education office.
For families dealing with both a speech delay and possible autism, autism spectrum speech therapy looks a bit different from standard speech therapy. It often works on communication intent, more than piling on words, and sometimes brings in augmentative and alternative communication (AAC) supports like picture systems or speech-generating devices.
What causes speech delays in children?
There's rarely one clean answer. Speech and language development rides on a chain of things working together: hearing, oral motor function, thinking skills, social interaction, and how the brain processes it all. A gap anywhere in that chain can slow things down.
Hearing loss is the first thing to rule out. About 2 to 3 per 1,000 newborns are born with some degree of hearing loss, and many more pick it up from repeated ear infections in the toddler years [6]. A child can pass a newborn hearing screen and still develop hearing trouble later. If there's any doubt, ask for a full audiological evaluation, more than an in-office hearing check.
Oral motor difficulties affect some children's ability to coordinate the muscles of the mouth, lips, and tongue. Childhood apraxia of speech is a specific motor speech disorder in this bucket. It's fairly rare, estimated at 1 to 2 per 1,000 children, but it gets missed a lot, because kids with apraxia often understand well and clearly know what they want to say [7].
Genetic conditions like Down syndrome, fragile X syndrome, and various chromosomal differences commonly include speech and language delays as part of a broader profile. In those cases, speech therapy fits inside a larger support plan.
Prematurity raises the risk. Children born before 34 weeks have higher rates of speech and language delays, and it's standard to use their corrected age (adjusted for prematurity) when checking milestones up to age 2.
Family history counts too. If a parent, sibling, or close relative had a speech or language delay, the child's odds go up. Nobody knows exactly how much of language is genetic, but twin studies put heritability somewhere around 50 to 70 percent [8].
And sometimes no single cause turns up. Language delay with no known cause used to be called "specific language impairment," and the newer term is "developmental language disorder." It's one of the most common developmental conditions there is, affecting roughly 7 percent of kindergarteners [2].
How is a speech delay diagnosed?
Diagnosis starts with an evaluation by a licensed speech-language pathologist (SLP). Pediatricians screen for speech and language delays at well visits (usually at 9, 18, 24, and 30 months, with tools like the M-CHAT-R or ASQ), but a screen is not an evaluation. A positive screen, or a parent's concern, should push things toward a full evaluation [3].
A full SLP evaluation usually includes:
- Standardized tests that compare the child's language to age norms. Common ones are the Preschool Language Scales (PLS-5) and the Clinical Evaluation of Language Fundamentals (CELF-Preschool).
- Watching spontaneous play and communication.
- A parent interview covering developmental history, how the child communicates at home, and any regression.
- A hearing screening (or a referral to audiology if anything looks off).
- Analysis of the child's speech sounds (phonology) and how understandable they are.
Evaluations run 60 to 90 minutes and end in a written report with standard scores, a diagnosis if the criteria are met, and recommendations.
For children under 3, evaluations through your state's early intervention program are free under Part C of the Individuals with Disabilities Education Act (IDEA). You don't need a doctor's referral. You can call your state's early intervention program yourself [9]. For children 3 and older, the school district has to provide a free evaluation under Part B of IDEA once you request it in writing. In most states the district has 60 days from your written request to finish the evaluation, though some states run on different timelines, so confirm the one where you live.
Going through insurance or paying out of pocket, an evaluation runs roughly $200 to $500 depending on location and provider. Many insurance plans cover speech-language evaluations with a doctor's referral.
When should I call the doctor about my child's speech?
The honest answer: sooner than you think you need to.
Pediatricians hear "he's just a late talker, he'll catch up" from well-meaning relatives all the time. Sometimes it's true. But nothing lets you tell from the outside whether a specific late talker will catch up on their own. The research on late bloomers is genuinely mixed. Roughly 70 to 80 percent of late talkers with no other developmental concerns do reach their peers by school age, but the 20 to 30 percent who don't are exactly the kids who would have gained from earlier help [2].
Waiting when a child doesn't need help costs almost nothing. Waiting when a child does need help costs something real. Language skills at age 5 predict reading in elementary school, and the gap between children with lasting language difficulties and their peers tends to widen over time, not shrink [2].
Call your pediatrician, or request an early intervention evaluation directly, if:
- Your child is missing any milestone in the table above.
- Something feels off, even if you can't name it.
- Your child lost words or skills they used to have.
- Your child isn't responding to their name by 12 months.
- You're getting "wait and see" advice that doesn't sit right.
You don't have to wait for the next scheduled well visit. Call and say: "I have a concern about my child's speech and I'd like to discuss it." You can also contact your state's early intervention program directly, skipping the pediatrician entirely.
What does early intervention for speech delay actually involve?
Early intervention is the system of services for children under 3 with developmental delays. Under Part C of IDEA, families who qualify get an Individualized Family Service Plan (IFSP) that spells out what services the child receives, how often, and where [9]. Speech-language therapy through early intervention usually happens in the home or a childcare setting, delivered by an SLP, often once or twice a week.
With young children, the approach leans hard on parent coaching. The research keeps showing therapy works best when parents use the same strategies all day long, more than during one 45-minute session a week. Your SLP will teach you techniques like following your child's lead, expanding what they say, and building on their communication attempts instead of drilling words [10].
At 3 and older, services move to the school district. The school evaluates the child, and if they qualify, an Individualized Education Program (IEP) gets written with specific speech and language goals. School-based therapy is also free.
Private speech therapy runs alongside school services, or instead of them, for many families. It costs roughly $100 to $300 per session without insurance, though many plans cover it. Private therapy often means more frequent sessions and more one-on-one attention, but school-based services are legally guaranteed and often very good.
On what works best for toddlers and preschoolers, the research favors naturalistic, play-based approaches over drill-based ones, especially for late talkers without other known diagnoses [10]. For kids with specific diagnoses like childhood apraxia of speech or autism, more structured, higher-frequency approaches tend to produce better outcomes.
If you want ways to support your child's communication at home between sessions, tools like the Little Words app are built to give parents structured, therapist-informed activities they can run every day with no clinical training. Take the quiz to see what fits your child's profile.
What's the difference between a late talker and a child who needs therapy?
"Late talker" is an informal clinical term, not a diagnosis. It usually means a toddler (typically 18 to 30 months) with a limited spoken vocabulary but otherwise typical comprehension, social skills, and development. The label implies a child who understands a lot, engages well, and uses gestures, but just isn't producing many words yet.
Late talkers as a group do better than children with broader language delays. But "late talker" and "no need for evaluation" are not the same thing. Even inside that group, early speech therapy tends to improve outcomes, and no reliable clinical method exists to tell in advance which late talkers will catch up on their own [2].
The children more likely to need ongoing support tend to show: language delays paired with comprehension trouble, few gestures, family history of language or learning difficulties, delays in other developmental areas, or speech delays that hang on past age 3.
A 2-year-old with 40 words instead of 50, who communicates well with gestures, understands everything said to them, and is social and curious, might reasonably get watchful waiting with a follow-up evaluation in 3 to 6 months. A 2-year-old with 10 words, limited comprehension, and few gestures is a much harder case for waiting.
How can parents support speech development at home?
You don't need a therapy degree to make a real difference in your child's language. The strategies SLPs teach parents work for anyone willing to slow down and be deliberate.
Talk more, but talk differently. Narrating your day ("now I'm pouring the milk... there it goes...") gives children a steady stream of language tied to real events. Talk about what's happening right now. Don't quiz. Questions pressure a child to perform. Comments invite them in on their own terms.
Follow their lead. Whatever your child is looking at, holding, or into is your best teaching moment. Point to it, name it, comment on it. Skip the urge to redirect them to what you think they should be doing.
Expand what they say. Your child says "dog," you say "big dog" or "dog running." This move, called expansion, hands the child a slightly richer model without correcting them.
Read together, and keep it interactive. Point to pictures, wait for the child to look, talk about what's happening on the page. You don't have to read every word. Talking about the pictures builds vocabulary in young children just as well.
Cut screen time for children under 2. The AAP recommends no screen media (except video chatting) for children under 18 to 24 months [3]. Language gets learned through live interaction, and background TV drops the amount of parent-child talk in a household.
Build communication opportunities. Don't head off every need before it's spoken. If the crackers sit in a container your child can see, wait for them to communicate something before you open it. Those natural moments of motivation do a lot of work.
None of this replaces therapy when therapy is needed. But it makes the time between sessions count, and for kids who don't qualify for services yet, it's the most evidence-backed thing a parent can do.
What about bilingual or multilingual children? Does raising kids in two languages cause speech delays?
No. This is one of the most stubborn myths in early childhood, and the research settles it. Bilingual children may carry a smaller vocabulary in each single language compared to monolingual peers, but their total vocabulary across both languages matches or beats monolingual children [11]. Bilingualism does not cause speech or language delays.
Assessment is where it gets tricky. Evaluate a bilingual child only in English, when English is their second or weaker language, and the assessment will lowball their true ability. A proper evaluation of a bilingual child has to look at both languages, ideally with an SLP trained in bilingual assessment or a bilingual interpreter used in a structured way.
If a bilingual child is showing signs of delay, the delay should appear in both languages, more than only the one they use less. A child who's fluent in Spanish but has thin English for their age is not language delayed. A child with limited vocabulary and comprehension in both Spanish and English is worth evaluating.
Don't let anyone tell you to drop your home language to help your child's English. No evidence backs that strategy, and it can cost the child a language and a connection to family.
How does an SLP decide what kind of speech therapy a child needs?
After the evaluation, the SLP writes a treatment plan built around the child's specific profile. Not all speech therapy looks alike.
For children whose main challenge is spoken vocabulary, naturalistic developmental behavioral intervention (NDBI) approaches like Enhanced Milieu Teaching build communication inside everyday routines, with the parent as a key partner.
For children with articulation or phonological difficulties, therapy gets more structured, working specific sounds in a deliberate order.
For children with apraxia of speech, frequent practice of specific motor sequences matters, usually more sessions per week than other profiles need.
For children who are minimally verbal or have significant autism-related communication differences, therapy might bring in AAC devices like speech-generating devices or picture exchange systems. Research keeps showing AAC does not sap a child's drive to talk. If anything, a reliable way to communicate tends to support verbal development, not undercut it [12].
Therapy goals go into the IFSP or IEP, and they should be specific and measurable, not vague. "Will increase vocabulary" is a weak goal. "Will produce 50 different word approximations spontaneously in play across three sessions" is what a good one looks like.
For families weighing online options, online speech therapy has become a practical route, especially for rural families or those stuck on waitlists. Research from the COVID-era telehealth expansion found outcomes comparable to in-person therapy for many speech and language goals.
Frequently asked questions
What are the first signs of speech delay in a 1-year-old?
At 12 months, watch for no babbling or babbling that stopped, no gestures like pointing or waving, no response to their own name, and no words with meaning (mama, dada used specifically). Any one of these is worth raising with a pediatrician. No babbling plus no pointing together is a particularly significant combination that warrants prompt evaluation, not watchful waiting.
Is my 2-year-old's speech delay a sign of autism?
Speech delay alone isn't a sign of autism. Concern rises when speech delay comes with other social communication differences: limited eye contact, not pointing to share interest (more than to request), little imitation, or repetitive behaviors. About 1 in 36 children are diagnosed with autism, and many do have speech delays, but most children with speech delays don't have autism. An evaluation looks at the full picture, more than words.
How do I get a free speech evaluation for my child?
For children under 3, contact your state's early intervention program. No doctor's referral needed; you can self-refer. For children 3 and older, contact your local public school district and request a special education evaluation in writing. Both are free under the federal Individuals with Disabilities Education Act (IDEA). Keep a copy of any written request and note the date, because response timelines are legally required.
Can speech delay be caused by too much screen time?
Heavy screen use is linked to less parent-child talk, which does matter for language. The American Academy of Pediatrics recommends no screen media for children under 18 to 24 months. That said, screen time is rarely the only cause of a significant delay. It can contribute by crowding out the live social interaction children need to learn language. Turning it off is worth doing, but get an evaluation too if the delay is significant.
What's the difference between a speech delay and childhood apraxia of speech?
Childhood apraxia of speech (CAS) is a motor speech disorder where the brain struggles to plan and coordinate the movements for speech. Children with CAS often know what they want to say, but the sounds come out inconsistently or not at all. A general speech delay is a broader pattern of slower language development. CAS is a specific diagnosis that needs a specialized evaluation and a different treatment approach than standard language delay therapy.
Should I wait and see if my child catches up on their own?
The evidence on waiting is mixed. About 70 to 80 percent of late talkers with an isolated expressive delay do catch up, but the 20 to 30 percent who don't are the ones who benefit most from early help. Requesting an evaluation costs nothing through early intervention or the school district, and it commits you to nothing. Getting evaluated is always lower risk than waiting, especially before age 3.
Does bilingualism cause speech delays in children?
No. The research is consistent that bilingualism does not cause speech or language delays. Bilingual children may have smaller vocabularies in each single language, but their combined vocabulary across languages is typical. If a bilingual child seems delayed, the delay should show up in both languages. Always insist that any evaluation assess the child in both languages, more than only the school or community language.
At what age is it too late to start speech therapy?
It's never too late, but earlier produces better outcomes. The brain's plasticity peaks in the first three years, which is why Part C of IDEA targets that window. Even so, children, teens, and adults all make meaningful progress with speech therapy. If you missed the early intervention window, don't treat that as a reason to skip therapy. Effective therapy at any age beats no therapy by a wide margin.
What should I expect from a speech therapy session for a toddler?
Toddler speech therapy usually looks like play. The therapist sets up activities that create communication opportunities and models language a step above the child's current level. For children under 3, a good SLP spends much of the session coaching you, more than working with the child directly. Parent coaching sits at the center because the strategies need to happen all day, more than in a single 45-minute session.
Can a speech delay affect reading later on?
Yes, and it's one of the strongest reasons to take early delays seriously. Language skills at age 5 are among the best predictors of reading ability in the elementary years. Children with lasting language delays face higher risk for dyslexia and reading difficulties. Early speech-language intervention supports communication and also builds the phonological awareness and vocabulary that reading depends on.
What does echolalia mean and is it a sign of speech delay?
Echolalia is the repetition of words or phrases heard from others, sometimes right away, sometimes long after. It's common in typically developing toddlers as a normal phase. When it lingers, or when most of a child's language is repeated scripts rather than original communication, it may point to autism or another language profile worth evaluating. Read more about what echolalia means and when it's a concern at our echolalia meaning overview.
How many words should a 2-year-old have?
By 24 months, most children have at least 50 words and are combining two into phrases ("more juice", "daddy gone"). That's the 50th percentile; some children have far more. Below 50 words at 24 months is a common threshold for referral, and below 10 to 15 words counts as a significant delay. Two-word combinations are as important a marker as word count at this age.
Is there a difference between boys and girls in speech development?
On average, girls start talking slightly earlier than boys and tend to have larger vocabularies in early toddlerhood. The difference is modest, though, and there's enormous overlap. Speech delays get diagnosed more often in boys, roughly 3 to 4 boys per girl for conditions like autism. That gap is partly biological and partly reflects that some assessment tools were historically normed more on male samples. Boys deserve evaluation just as much as girls. Don't assume boys just talk later.
Sources
- American Speech-Language-Hearing Association (ASHA), Speech and Language Developmental Milestones: About 15 to 20 percent of 2-year-olds show some kind of speech or language delay; milestone norms for all ages
- Reilly S et al., "Late Talking in Community and Clinical Samples", Pediatrics, 2010: Approximately 20 to 30 percent of late talkers go on to have persistent language difficulties; language skills at age 5 predict reading outcomes
- American Academy of Pediatrics (AAP), Developmental Surveillance and Screening Policy: AAP recommends developmental screening at 9, 18, 24 and 30 months; recommends no screen media under 18-24 months; flags no words by 16 months as a referral indicator
- Ozonoff S et al., "Prospective Investigation of the First Symptoms in Autism", Pediatrics, 2010: Absence of babbling by 12 months is associated with increased risk for autism spectrum disorder
- CDC, Autism and Developmental Disabilities Monitoring (ADDM) Network, 2023: About 1 in 36 children is diagnosed with autism spectrum disorder
- CDC, Hearing Loss in Children Data and Statistics: About 2 to 3 per 1,000 newborns are born with hearing loss
- Shriberg LD et al., "Prevalence of Speech Delay in 6-Year-Old Children", JSLHR, 1999: Childhood apraxia of speech estimated at 1 to 2 per 1,000 children
- Bishop DV, "Genetics of specific language impairment", Journal of Child Psychology and Psychiatry, 2006: Twin studies suggest heritability of language development around 50 to 70 percent
- U.S. Department of Education, IDEA Part C Early Intervention Program: Part C of IDEA entitles children under 3 with developmental delays to free evaluation and services; families can self-refer without a doctor's referral
- Kaiser AP and Roberts MY, "Parent-Implemented Enhanced Milieu Teaching", JSLHR, 2011: Naturalistic, parent-implemented speech therapy approaches show strong outcomes for late talkers; parent coaching is a core component of effective early intervention
- Bialystok E, "Bilingualism: The Language and Cognition of Bilingual Children", Cambridge University Press / Developmental Science, 2007: Bilingual children's total vocabulary across both languages is comparable to monolinguals; bilingualism does not cause speech or language delay
- Millar DC, Light JC, Schlosser RW, "The impact of augmentative and alternative communication intervention on the speech production of individuals with developmental disabilities", JSLHR, 2006: AAC does not reduce verbal speech motivation; AAC intervention tends to support rather than undermine verbal development
