
Last updated 2026-07-09
TL;DR
Most children say their first word around 12 months, combine two words by 24 months, and speak in short sentences by age 3. The American Speech-Language-Hearing Association and the American Academy of Pediatrics publish specific milestones by age. Missing two or more in a row is a reason to ask your pediatrician for a referral, not a reason to wait and see.
What are speech and language milestones, and why do they matter?
Speech milestones are the communication behaviors most children show by a certain age. They cover three overlapping areas: receptive language (understanding what others say), expressive language (talking), and speech sounds (the actual pronunciation). Language development also includes gesture and play, which show up earlier than words and tell you just as much.
They matter because catching a delay early changes outcomes. The research is consistent here. Children who start early intervention before age 3 make bigger gains than children who start later, because the brain rewires its language circuits fastest in the first few years of life [1]. Milestones are the tripwire that tells you to look closer.
They also matter because parents get bad advice. "He's just a late talker, he'll catch up" is sometimes true and sometimes not. The only way to know which situation you're in is to measure the child against a real benchmark, not a neighbor's reassurance. That's what this chart gives you.
What does the speech milestones chart look like from birth to age 5?
The table below pulls from ASHA's published milestones and the CDC's developmental milestone checklists, updated in 2022 [2][3]. Ages are "by" ages. A child should reliably show the skill by that point, not necessarily on that exact birthday.
| Age | Receptive language | Expressive language | Speech sounds |
|---|---|---|---|
| Birth to 3 months | Startles to loud sounds; calms to familiar voice | Cries differently for hunger vs. pain; coos | Vowel-like sounds ("ooh", "aah") |
| 4 to 6 months | Turns head toward sound; responds to name | Babbles single consonants ("ba", "da"); laughs | Begins mixing consonants and vowels |
| 7 to 12 months | Understands "no"; recognizes a few words | Babbles in long strings; first word by 12 months | "p", "b", "m" sounds clear |
| 13 to 18 months | Follows simple one-step directions | 5 to 20 words; uses words more than gestures | Speech mostly unintelligible to strangers |
| 19 to 24 months | Points to named pictures in a book; understands about 300 words | 50+ words; beginning two-word phrases | About 50% intelligible to strangers |
| 25 to 36 months | Understands two-step directions; grasps pronouns | 200 to 1,000 words; 3-word sentences; asks questions | About 75% intelligible; "p", "b", "m", "w", "h" mastered |
| 37 to 48 months | Understands most of what is said in familiar settings | 1,000+ words; tells simple stories; uses past tense | About 75-80% intelligible to strangers; most sounds except "r", "th", "l" |
| 49 to 60 months | Understands most complex sentences | Sentences of 5 to 6 words; tells longer stories in sequence | Nearly 100% intelligible; most sounds mastered |
A few things to notice. The gap between what a child understands and what a child says is normal and wide, especially before age 2. A 20-month-old might understand 200 words but say only 15. That's expected. What's not expected is a child who neither understands nor talks much for their age.
Intelligibility means how much of a child's speech a stranger can understand. It grows steadily. By age 4, four out of five words should be clear to someone who doesn't know the child. By age 5, essentially everything should be. A 4-year-old whose speech strangers can only catch about half the time needs a speech evaluation, regardless of how many words the child uses. [2][3]
What are the red flags at each age?
Red flags are not diagnoses. They are signals that say "get an evaluation now" instead of "wait a few more months."
The CDC and AAP list these specific red flags [3][4]:
By 2 months: No social smile in response to people.
By 6 months: No babbling. No back-and-forth cooing. No response to sound.
By 9 months: No babbling at all. No pointing, waving, or other gestures. No response to their name.
By 12 months: No words, no babbling with consonants, no gestures like pointing or waving. No consistent response to their name.
By 16 months: No single words. This is one of the most frequently cited thresholds in the research.
By 24 months: Fewer than 50 words, or no two-word combinations. This is the milestone most parents have heard of. The AAP recommends formal evaluation at this point, not six more months of waiting [4].
By 36 months: Strangers cannot understand most of what the child says. The child does not use simple sentences.
Any age: Loss of language skills the child once had. This regression is an urgent signal, especially between 15 and 24 months, and warrants prompt medical evaluation.
One thing worth saying plainly: these red flags apply to all children, including bilingual children. Bilingual kids may mix languages and have somewhat smaller vocabularies in each single language, but their total vocabulary across both languages should still hit age-appropriate ranges. A bilingual 24-month-old who says 10 words total across both languages needs an evaluation, not more time in one language [5].
How are speech milestones different from language milestones?
Parents use these terms interchangeably. Clinicians do not. Speech is the motor act of making sounds: how clearly and accurately the mouth, tongue, and lips produce phonemes. Language is the system of meaning: vocabulary, grammar, and the ability to understand and express ideas.
A child can have a speech problem (unclear sounds, hard to understand) with perfectly normal language. The ideas are there, the grammar is on track, the mouth just isn't cooperating. That child probably has an articulation disorder or something like childhood apraxia of speech. A child can also have a language problem with clear speech sounds. Every word is easy to understand, there just aren't many of them and the sentences don't connect. That points toward a language delay or language disorder.
Many children have both. And some children, particularly those on the autism spectrum, carry a third layer: pragmatic language, the social use of language. Taking turns in conversation, reading tone of voice, using language to connect with people, this is its own skill set that doesn't always match a child's vocabulary or articulation. Going into an evaluation knowing whether the concern is speech, language, pragmatics, or some mix will help you ask sharper questions.
For a closer look at one specific pattern, echolalia is a common communication behavior in autistic children that gets mistaken for a language delay when it's actually a stage of language learning.
What counts as a late talker?
A late talker is a toddler, usually between 18 and 30 months, who has fewer words than expected for their age but no other developmental concerns. The classic research definition is a 24-month-old with fewer than 50 words or no two-word combinations [6]. These children have age-appropriate understanding, social skills, play, and motor development. Only the words are lagging.
About 13 to 17 percent of 2-year-olds are late talkers by this definition [6]. Roughly half catch up on their own by age 3, which is where the "wait and see" advice comes from. The problem is that you cannot reliably predict at 24 months which child will catch up and which won't. The children who don't often show continued language differences into school age, affecting reading, writing, and school performance.
So get the evaluation anyway. An evaluation from a speech-language pathologist (SLP) does not commit you to years of therapy. It gives you information. If the SLP says the child is tracking fine, you've lost an afternoon. If the SLP finds something, you've gained months of intervention time you can't get back later.
If cost or access is the barrier, early intervention services under the Individuals with Disabilities Education Act (IDEA) Part C provide free evaluations for children under 3 in all 50 states. You do not need a pediatrician referral to request one, though it can speed things up [1].
How do speech milestones apply to autistic children?
Autism and speech delay overlap a lot, but they are not the same thing. About 25 to 30 percent of autistic children are minimally verbal or nonverbal, using fewer than 30 functional words [7]. Many more have language that looks typical on the surface but shows differences in pragmatic use, prosody (the rhythm and melody of speech), and social communication.
The milestones in the chart above apply to autistic children too. The difference is that autistic children often show uneven profiles: strong vocabulary with weak sentence structure, or clear speech sounds with little initiation of communication. Receptive language can also be harder to assess, because an autistic child may understand more than they show in a standard test setting.
The 12-month red flag of not responding to name is one of the earliest and most replicated signals associated with autism. It isn't diagnostic on its own, but it's taken seriously. The loss of language between 15 and 24 months, sometimes called regression, happens in roughly 20 to 30 percent of autistic children and is one of the features that separates autism from a plain language delay [7].
For autistic children who are minimally verbal, AAC devices (augmentative and alternative communication) are often part of speech therapy. Not a replacement for developing speech, but a bridge that cuts frustration and builds language at the same time. There's solid evidence that AAC does not suppress speech development and often supports it [8]. Read more on autism spectrum speech therapy for approaches built for this group.
Little Words is designed around this kind of individualized support. The app's AI-guided activities adjust to a child's current communication level, whether they're just starting to babble or working on sentence structure, so families can keep practicing between therapy sessions.
When should I call the pediatrician vs. contact a speech therapist directly?
You can do both at once. No rule says you have to go through the pediatrician first.
Call the pediatrician when a well-child visit raised the question, when you want a hearing test ordered (hearing loss is the most common cause of speech delay and should be ruled out first), or when you want a referral to a developmental pediatrician because you're seeing concerns beyond speech [4].
Contact a speech therapist directly when you've been told to wait and see but your gut says something is off, when you want a second opinion, or when you're past the under-3 window and IDEA Part C is no longer an option. Private SLPs can evaluate and treat without a physician's referral in most states, though insurance coverage varies.
For children under 3, call your state's early intervention program. You can find your state's contact through the IDEA website. Evaluations are free and must be completed within 45 calendar days of the referral [1]. If the child qualifies, services come at no cost or on a sliding scale depending on the state.
For children 3 and older, the public school system takes over under IDEA Part B. Your local school district must evaluate any child you refer, at no cost, if you have reason to suspect a disability affecting education. This holds even if the child isn't enrolled in school yet [1].
Do speech milestones differ for bilingual or multilingual children?
Bilingual children get evaluated using monolingual norms sometimes, and that produces false positives for delay. A child learning two languages at once usually has a smaller vocabulary in each single language than a monolingual peer, but the total vocabulary across both languages should land roughly in line with monolingual norms [5].
ASHA states plainly that bilingualism does not cause speech or language disorders and that children learning two languages simultaneously should meet communication milestones in both, though the timing of some milestones may differ slightly [5].
The red flags still apply across languages. A bilingual 2-year-old who uses fewer than 50 words total across all languages, who doesn't respond to their name, who has lost words they used to have, that child needs an evaluation regardless of language background. The evaluation should be done by an SLP experienced in bilingual assessment, or with a trained interpreter, because standardized English-only tests alone are not valid for bilingual children.
One practical move: ask the SLP whether they're calculating total conceptual vocabulary (words the child knows in any language) rather than English words only. If they're counting English alone, the score will come out artificially low.
What speech sounds should my child be able to make, and by when?
Speech sound acquisition follows a rough but well-studied order. The easiest sounds to produce, the ones you can see on the lips and make with both lips together, come first. The harder sounds, especially those that need precise tongue placement against the roof of the mouth or between the teeth, come last.
Here's a simplified version of the order, based on McLeod and Crowe's 2018 cross-linguistic review in the American Journal of Speech-Language Pathology, which analyzed data from 27 languages and over 30,000 children [9]:
| Sound(s) | Typically mastered by age |
|---|---|
| p, b, m, h, w | 3 years |
| n, k, g, d, t, f | 4 years |
| y, v, ng | 4 to 5 years |
| l, j (as in "jump") | 5 to 6 years |
| r | 6 to 8 years |
| s, z | 6 to 7 years |
| sh, ch, zh | 6 to 7 years |
| th (voiced and voiceless) | 7 to 8 years |
These are population-level norms. Individual variation is real. Some children get their "r" at 5, some not until 8. But a 7-year-old who still can't produce "p" or "b" clearly is unusual and worth checking.
Errors that are consistent and follow a pattern (substituting "t" for "k", or dropping final consonants) are different from random inconsistency. Inconsistent errors on the same word from one attempt to the next is one of the hallmarks of apraxia of speech, a specific diagnosis that changes the type of therapy that works best.
What should I actually do at home if I'm worried about my child's speech?
Get your child's hearing tested first. Full stop. Mild to moderate hearing loss is easy to miss, because children who have it can still hear some things, respond to their name sometimes, and seem to follow conversations. But even mild hearing loss in one or both ears sets back speech and language. Your pediatrician can order an audiological evaluation, and most children's hospitals and audiology clinics can test children as young as a few months old.
While you wait for an evaluation, the things that actually move the needle at home are simple. Talk to your child constantly about what's happening right now: narrate your actions, name the objects you're both looking at, comment on what the child is doing. This builds vocabulary and shows the child that communication is about sharing attention. Follow your child's lead in play instead of directing it. Research on parent-implemented language intervention consistently shows that following the child's interest and expanding on what they say or do beats drilling words [10].
Read out loud every day. Picture books with simple, repetitive text are ideal for toddlers. The point isn't comprehension of the story. It's shared attention, vocabulary, and turn-taking.
Limit screens. Not because screens are evil, but because passive screen time has not been shown to build language the way live interaction does. The AAP recommends avoiding screen media for children under 18 to 24 months other than video chatting [4].
For families who want structured practice between therapy sessions, tools like Little Words can bridge the gap with activities built around a child's current level. And online speech therapy has expanded a lot in the last few years and is often easier to access than in-person services.
How accurate are speech milestone charts, and what do they miss?
Milestone charts are built on population data. They tell you what most children do by a given age, but "most" in developmental research usually means somewhere between the 10th and 90th percentile. A child at the 15th percentile still sits inside the range most charts describe, even though they're well behind the average child.
Nobody has great data on the true variability of typical development, especially for underrepresented populations. Most of the foundational studies looked at white, monolingual, English-speaking, middle-class children in Western countries. The 2018 McLeod and Crowe study tried to address the speech sound question across languages, but broader language milestone data is still skewed [9].
Charts also don't capture the quality of communication. A child who says 50 words but only uses them to label objects, never to request, protest, comment, or connect with people, shows a different profile than a child who says 50 words and uses them flexibly and socially. Quantity and quality both tell you something.
What charts do well is give you a concrete hook for the conversation with your pediatrician. "He's 18 months and says four words. The chart says 5 to 20" gets a better response than "I feel like he's behind." That specificity changes what happens next.
Frequently asked questions
What is the most important speech milestone for a 2-year-old?
At 24 months, the two biggest markers are having at least 50 words and combining two words into phrases like "more milk" or "daddy go." The AAP recommends formal evaluation if either is missing. Total word count and the ability to combine words matter more at this age than how clearly the words come out.
My 18-month-old only has 5 words. Is that a red flag?
Possibly. ASHA lists 16 months as the age by which a child should have at least one word, and by 18 months most children have between 5 and 20 words. Five words at 18 months sits at the low end of typical and warrants a conversation with your pediatrician, especially if comprehension seems off too. Requesting an early intervention evaluation is reasonable.
Can a child have a speech delay but still be very smart?
Yes, absolutely. Intelligence and speech development are different systems. Children with high intellectual ability can have apraxia of speech, language delays, or autism-related communication differences. And clear, fluent speech tells you little about cognitive ability. A speech delay should never be read as a measure of a child's intelligence or potential.
Do boys really talk later than girls?
On average, girls tend to reach some early language milestones slightly ahead of boys, but the difference is small and the overlap is enormous. It is not a reason to delay evaluation. A boy missing milestones by large margins needs the same attention as a girl in the same spot. Sex-based "late talker" stereotypes lead to real delays in getting help.
What is the difference between a speech delay and a speech disorder?
A speech delay means a child follows the typical developmental sequence but more slowly than peers. A speech disorder means the pattern itself is atypical, not simply slow. Apraxia of speech, for example, is a disorder of motor planning rather than a delay. The distinction matters because delays and disorders often respond to different types of therapy.
At what age should I stop waiting and see and get an evaluation?
Honestly, there's no age where waiting and seeing beats acting if you have a real concern. Early intervention services are free for children under 3. School districts must evaluate children 3 and older at no cost. The only thing you lose by evaluating early is a little time. You can lose months or years of the intervention window by waiting.
How do I request an early intervention evaluation for my child?
In the US, call your state's early intervention program directly. You do not need a pediatrician referral, though one from your doctor can help. Under IDEA Part C, the program must complete the evaluation within 45 calendar days of your referral at no cost to you. Search "early intervention" plus your state name to find the contact number.
Can too much screen time cause a speech delay?
Screen time doesn't cause speech delay the way an infection causes illness, but it displaces the back-and-forth interaction that builds language. The AAP recommends avoiding screen media for children under 18 to 24 months other than video chatting. For older toddlers, co-viewing and talking about what's on screen beats passive solo watching.
What should I expect from a speech-language pathology evaluation?
A good evaluation takes 60 to 90 minutes. The SLP will observe play, use standardized tests appropriate for the child's age, take a language sample, and interview you about history and daily communication. For children under 3, the setting is usually your home. For older children, it may be a clinic or school. You'll get a written report with scores and recommendations.
Do speech milestones differ for premature babies?
Yes. Premature babies are typically assessed using their corrected age (actual age minus weeks born early) rather than chronological age, at least through the first year or two of life. A baby born 2 months early, at 18 months old, is expected to perform closer to a 16-month milestone level. Ask your pediatrician how they want to calculate milestones for your child.
Is echolalia a sign of a speech delay or disorder?
Echolalia, repeating words or phrases heard elsewhere, is a normal stage of language development in toddlers. It's also common in autistic children and can be a functional communication strategy. It becomes a concern when it's the primary or only form of communication well past age 3, or when there's no movement toward spontaneous, flexible language. See our article on echolalia for more detail.
My child was evaluated and the SLP said to wait. What should I do?
Ask the SLP to explain specifically what they observed and what progress they'd expect to see in 3 to 6 months. Get the recommendation in writing if you can. Then set a calendar reminder. If you don't see the expected progress by the follow-up date, request another evaluation. A second opinion from a different SLP is always within your rights.
Sources
- IDEA.ed.gov, Individuals with Disabilities Education Act Part C overview: IDEA Part C provides free evaluations and services for children under 3 with developmental delays; evaluations must be completed within 45 calendar days of referral
- ASHA, Speech and Language Developmental Milestones: ASHA's published milestones for receptive language, expressive language, and speech sound development from birth through age 5
- CDC, Learn the Signs. Act Early. Developmental Milestones (2022 update): CDC's updated 2022 developmental milestone checklist, including speech and language red flags by age
- American Academy of Pediatrics, Caring for Your Baby and Young Child: AAP recommends formal speech-language evaluation if a child has fewer than 50 words or no two-word combinations by 24 months; recommends avoiding screen media other than video chatting for children under 18-24 months
- ASHA, Bilingual Service Delivery: ASHA states bilingualism does not cause speech or language disorders and that total conceptual vocabulary across both languages should be used in evaluation
- Rescorla, L. (2011). Late talkers: Do good predictors of outcome exist? Developmental Disabilities Research Reviews, 17(2), 141-150.: Late talker is defined as a 24-month-old with fewer than 50 words or no two-word combinations; approximately 13-17% of 2-year-olds meet this definition
- Tager-Flusberg, H., et al. (2005). Towards the study of language acquisition in minimally verbal children with autism spectrum disorder. PNAS.: Approximately 25-30% of autistic children are minimally verbal, using fewer than 30 functional words; language regression occurs in approximately 20-30% of autistic children
- Millar, D.C., Light, J.C., & Schlosser, R.W. (2006). The impact of augmentative and alternative communication intervention on speech production. American Journal of Speech-Language Pathology, 15(3), 228-237.: AAC intervention does not suppress speech development and often supports it
- McLeod, S., & Crowe, K. (2018). Children's consonant acquisition in 27 languages. American Journal of Speech-Language Pathology, 27(4), 1546-1571.: Cross-linguistic review of speech sound acquisition norms across 27 languages and over 30,000 children; provides age-of-mastery data for consonant sounds
- Roberts, M.Y., & Kaiser, A.P. (2011). The effectiveness of parent-implemented language interventions. American Journal of Speech-Language Pathology, 20(3), 180-199.: Parent-implemented language intervention following the child's lead and expanding on child communication is effective for toddlers with language delays
