Speech Delay and Speech Sound Disorder Statistics 2026 (US and Canada)

About 6.9% of US children aged 3 to 17, roughly 4.3 million children, currently have a speech or other language disorder, according to the 2024 National Survey of Children's Health. The rate is highest in preschoolers (10.7% at ages 3–5) and falls to 3.6% by the teenage years; boys are affected about twice as often as girls (9.1% vs 4.6%). Most young children with speech delays catch up, but about 3.6% of 8-year-olds still have a speech sound disorder and 1–2% of young adults keep residual errors. In Canada, 3.9% of children aged 2 to 4 have difficulty being understood, according to Statistics Canada.

This page brings together the current numbers on speech delay and speech sound disorders (articulation and phonological disorders) in the US and Canada. Each figure links to its source and shows the year the data were collected, which matters: many statistics still quoted today come from 2012 or earlier. Last checked: October 20, 2026.

Key speech delay statistics

• 6.9% of US children aged 3–17 (about 4.27 million) currently have a speech or other language disorder, up from 5.9% in 2020 (NSCH 2024).

• 10.7% of US children aged 3–5 have one, compared with 8.8% at ages 6–11 and 3.6% at ages 12–17 (NSCH 2024).

• Boys 9.1%, girls 4.6% (NSCH 2024): across studies, boys are about 1.5 to 2 times as likely to have a speech problem, not 3 times as often claimed.

• 3.8% of 6-year-olds had a speech delay in the best-known US population study (Shriberg et al., 1999).

• 3.6% of 8-year-olds still had a persistent speech sound disorder in a UK cohort of 7,385 children, about one child per class of 30 (Wren et al., 2016).

• 16–17% of US toddlers now receive a speech delay diagnosis by age two, a level that held steady through 2023 and 2024 (Epic Research, 2025).

• 48.8% of US children with a voice, speech, swallowing or language problem saw a specialist for it in 2022 (Healthy People 2030).

• 31.7% of US preschoolers in special education are served for a speech or language impairment, the second-largest category (47th IDEA Report to Congress).

• 3.9% of Canadian children aged 2–4 and 1.5% of those aged 5–17 have parent-reported difficulty understanding and being understood (Statistics Canada, 2023).

• By age 5, most English consonant sounds are acquired; /r/ and the "th" sounds come last (Crowe & McLeod, 2020).

Why speech delay statistics disagree

Published rates range from about 1% to over 20% because studies count different things. Before comparing two numbers, check what was measured:

"Speech" problems are about producing sounds (articulation, phonology, stuttering). "Language" problems are about understanding and using words and sentences. Many surveys combine the two.

How common are speech delays in children?

• NSCH 2024: 6.9% of US children aged 3–17 currently have a speech or other language disorder; another 3.2% were once told they had one but no longer do. The figure was 5.9% in 2020, 6.3% in 2021–22, 6.5% in 2022–23 and 6.6% in 2023; year-to-year changes are within the margin of error, but the direction has been upward (Data Resource Center for Child and Adolescent Health).

• NHIS 2012: 5.0% of US children aged 3–17 had a parent-reported speech problem in the past year, and 7.7% had any communication disorder, including voice and swallowing (NCHS Data Brief 205). The National Institute on Deafness and Other Communication Disorders still uses this 2012 survey for its headline: "approximately 1 in 14 (7.2%)" children have a voice, speech or language disorder (NIDCD).

• Expert range: "The estimated prevalence of speech and language disorders ranges between 3% and 16% of US children and adolescents aged 3 to 21 years," according to the US Preventive Services Task Force, citing the National Academies (USPSTF, 2024).

• Speech sound disorders specifically: in a population study of 1,328 US 6-year-olds, 3.8% had a speech delay (Shriberg, Tomblin & McSweeny, 1999). In an Australian community cohort, 3.4% of 4-year-olds had a speech sound disorder (Eadie et al., 2015). Across studies, ASHA notes estimates of 2.1% to 23% for ages 4–6 and cautions that differences in methods "may lead to an overestimate" (ASHA Practice Portal).

Speech delay statistics by age

The 2012 federal survey shows the same pattern: any communication disorder in 11.0% of children aged 3–6, 9.3% at 7–10 and 4.9% at 11–17 (NCHS).

Are boys more likely to have a speech delay?

Yes, by roughly 1.5 to 2 times, depending on the study:

• NSCH 2024: 9.1% of boys vs 4.6% of girls aged 3–17 have a speech or other language disorder, about 2 to 1 (NSCH). In 2023 the figures were 8.1% and 5.0%.

• Shriberg 1999: speech delay was "approximately 1.5 times more prevalent in boys (4.5%) than girls (3.1%)" at age 6.

• Wren 2016: persistent speech sound disorder at age 8 in 4.6% of boys and 2.5% of girls, a ratio of 1.8 to 1.

• ASHA: "a ratio of about 2:1 in grade school children."

• Canada, 2023: 5.0% of boys and 2.7% of girls aged 2–4 have difficulty being understood (Statistics Canada).

The US Preventive Services Task Force says boys are "more than twice as likely to be affected than girls." The claim that boys are three times as likely does not match these studies; NIDCD's "two to three times" figure refers to stuttering.

Do children outgrow speech delays?

Many do, but the numbers come from small or clinic-based studies, and the answer depends on what kind of delay a child has.

• About 70–75% of preschoolers with speech delay had normal speech by age 6 in clinic-based studies; the prospective evidence is 12 of 17 children (70.6%) followed by Shriberg's team.

• For toddler language delays, about 60% of children with expressive-only delay and 25% with both receptive and expressive delay recovered without intervention, according to one systematic review cited by the USPSTF.

• Late talkers are still at higher risk later: at age 7, 7% of children who had been late talkers at 24 months scored below normal on speech, against 2% of other children (Rice et al., 2008).

• 3.6% of 8-year-olds in the UK cohort still had a speech sound disorder, a conservative count because it left out children whose only errors were distortions such as a lisp.

• In young adults, "1 to 2% of the young adult population overall may present with these errors," and up to 75% of the errors still present at age 9 "may resolve on their own" by the end of high school (Flipsen, 2015).

• Speech problems often travel with other difficulties: 40.8% of Australian 4-year-olds with a speech sound disorder also had a language disorder (Eadie et al., 2015), and a 2025 meta-analysis found children with speech sound difficulties scored about 0.6 standard deviations lower on language and reading (Walquist-Sørli et al., 2025).

• In a Canadian cohort followed to age 25, children with speech-only problems at age 5 did about as well as their peers as adults, while those with language impairments had poorer outcomes (Johnson, Beitchman & Brownlie, 2010).

At what age should children say each sound?

A review of 15 studies covering 18,907 US children found that "most consonants were acquired by 5;0" (age 5 years, 0 months). The ages below are the average ages at which studies found 90% of children producing each sound correctly (Crowe & McLeod, 2020):

• Across 27 languages, children produce at least 93% of consonants correctly by age 5 (McLeod & Crowe, 2018).

• Intelligibility: parents judge typical children about 50% intelligible at 22 months, 75% at 37 months and 100% at 47 months. When unfamiliar listeners score single words, children reach 50% at 31 months, 75% at 49 months and only 90% by 83 months, according to ASHA's summary of two studies.

• CDC's revised milestone checklists list only skills that at least 75% of children reach by each age, a change made in part "to discourage a wait-and-see approach" (Zubler et al., 2022).

Our speech sound development chart shows these ages sound by sound, and the word lists for late sounds such as R, S and TH are sorted by position.

How many children with speech problems get therapy?

• In 2012, 55.2% of US children aged 3–17 with any communication disorder received intervention services in the past year, and 67.6% of those with a speech problem did (NCHS). In the same NCHS data, services were less common for Black (45.8%) and Hispanic (47.3%) children than for white children (60.1%), and for girls (47.8%) than boys (59.4%). NIDCD's version of the survey, which leaves out swallowing problems, puts the overall share at 59.7%.

• In the newest federal measure, only 48.8% of children with a voice, speech, swallowing or language problem saw a specialist in 2022 (Healthy People 2030). The question changed, so this is not directly comparable with 2012.

• About 75% of children with speech or language disorders had ever received services (2012 survey data), and speech-language pathologists were the most common provider (Davidson et al., 2022).

• Only about 30% of US children aged 9–35 months received a parent-completed developmental screening in the past year, from 17% in Mississippi to 59% in Oregon (USPSTF, 2024).

• In a 2023 ASHA survey of SLPs (9.6% response rate), 48% of respondents said parents typically wait 6 months to a year after noticing symptoms before acting (ASHA).

In schools (IDEA Part B, fall 2023):

• 31.7% of preschoolers (3–5) in special education were served for a speech or language impairment, second only to developmental delay (45.0%).

• 17.9% of students aged 5–21 in special education had a speech or language impairment, second to specific learning disability (33.8%).

• That is 1.8% of all US residents aged 5–21, up from 1.5% in 2014 (47th Annual Report to Congress).

• In 2022–23, about 1.43 million students were served for a speech or language impairment. Its share of special education has fallen from 35.2% in 1976–77 to 19.0%, even as the number of students has grown (NCES Digest, Table 204.30).

• 89% of these students spend at least 80% of the school day in general classes (NCES).

• In 2026, 89.7% of school SLPs regularly served students with speech sound disorders, about 20 each (ASHA 2026 Schools Survey).

Early intervention (IDEA Part C): 460,321 US infants and toddlers, 4.2% of all children under 3, received early intervention in 2023, up from 2.9% in 2014. Among 2-year-olds the share reached 7.5%, the highest in the 2014–2023 series (47th Annual Report). Part C does not report how many of these children are served for speech or language.

Did the pandemic increase speech delays?

Diagnoses rose; whether true prevalence rose as much is harder to say.

• US toddlers who turned two in early 2023 were 87.8% more likely to have a speech delay diagnosis than those who turned two in 2018 (Epic Research, 2023). A follow-up of 1,343,835 children found rates "remained steady at 16-17% in 2023 and 2024" rather than falling back (Epic Research, 2025).

• An analysis of 2.46 million US children under 5 found significant increases in first-time speech delay diagnoses in every age group after the pandemic began (Goodwin Cartwright et al., JAMA Pediatrics, 2024).

• A 2025 meta-analysis of 10 studies from 6 countries found 72% higher odds of language and communication delay in children exposed to the pandemic, but no difference in overall development (O'Connor et al., 2025).

• In the same 2023 ASHA survey, 69% of SLP respondents said they were getting more referrals for young children than before the pandemic.

• In Canada, a national cohort of 4,037 two-year-olds born during the pandemic found 13.0% of those born in the first wave were late talkers, falling to 8.0% for the third wave, and vocabulary overall "similar to historical norms" (Giesbrecht et al., 2025).

Medical-record studies count diagnoses, which also rise when more parents seek help and more doctors screen. The widely shared claim that speech delays "doubled" comes from one company's insurance-claims counts, not from prevalence data.

Speech delay statistics in Canada

We found no recent national study that tests Canadian children for speech sound disorders. The best national data come from parent reports in Statistics Canada's Canadian Health Survey on Children and Youth (CHSCY):

• 3.9% of children aged 2–4 (about 42,200) had difficulty understanding and being understood in 2023, the most common functional difficulty at that age. It was 5.0% for boys and 2.7% for girls (Statistics Canada, Table 13-10-0952-01).

• The 2019 figure for the same age group was 2.7%. The 2023 estimate is higher, though the two survey cycles covered slightly different populations.

• 1.5% of children and youth aged 5–17 (about 80,100) had this difficulty in 2023: 1.9% at ages 5–11 and 1.1% at 12–17. Among 5–11 year olds, 2.6% of boys and 1.1% of girls (Statistics Canada, Table 13-10-0951-01).

• The classic Canadian population study, of 1,655 kindergarten children in the Ottawa-Carleton region in the early 1980s, estimated that 16.2% to 21.8% had some speech or language impairment, most of them involving language (Beitchman et al., 1986). Canadian researchers often cite about 11% of kindergarten children with a speech sound disorder (Rvachew & Rafaat, 2014), a figure a later Canadian review attributes to the same Ottawa study.

• In that Ottawa cohort, more than 72% of children with a speech or language impairment at age 5 were still impaired at age 12 (Beitchman et al., 1994).

• In 2016, the Canadian Task Force on Preventive Health Care found the evidence "insufficient" to recommend for or against population screening for speech and language delay in children 5 and under (CMAJ, 2016).

• Canada had 12,111 regulated speech-language pathologists in 2024, or 29.3 per 100,000 people. That is roughly half the US figure of 61.9 per 100,000, by our comparison, though the US count is of ASHA-certified SLPs and the Canadian one of provincial registrants. Our SLP statistics break this down by province.

Speech delay statistics by province

Provinces publish different things, and we found none that publishes a clinical prevalence rate.

Alberta

• 9,380 Alberta students in grades 1–12 were coded with a "Communication Disability/Disorder" in 2025/26, up from 8,227 in 2019/20. The code covers articulation, phonology, voice, stuttering and social communication (Alberta Education open data).

• In early childhood services (before grade 1), 5,787 children were coded with a severe language delay and 2,395 with a moderate language delay in 2025/26, about 12% of the 66,809 children enrolled, by our calculation. These are funding codes, not prevalence.

Ontario

• The province says "about 1 in 10 children need extra help developing speech and language skills" (Government of Ontario).

• In 2026, the Auditor General found 1,608 students waiting for a speech-language assessment at three school boards (817 at Toronto Catholic, 696 at Peel, 95 at Upper Canada) (Auditor General of Ontario).

• A 2021 survey by the Ontario Association of Speech-Language Pathologists and Audiologists found full-time school SLPs served an average of 166 students per school year (242 if one outlier board is included), against a 2003 recommendation of fewer than 40 (OSLA, 2021).

Quebec

• In 2022, 11.5% of kindergarten children (about 9,710) were vulnerable in the "communication skills and general knowledge" domain, which includes clear articulation, up from 11.1% in 2017. Rates ranged from 6.3% in Bas-Saint-Laurent to 16.9% in Laval (Institut de la statistique du Québec).

• 23.2% of Quebec's 59,853 students with disabilities had a diagnosed language impairment in 2023–24, the second-largest group after autism (OPHQ, 2026).

• 11,276 people were waiting for public speech therapy in Quebec's CLSCs in 2025, with a median wait of 124.5 days (Santé Québec); see our speech therapy cost and wait time statistics.

British Columbia

• 14.3% of BC kindergarten children were vulnerable on the Early Development Instrument's communication scale in Wave 8 (2019–2022), unchanged from the previous wave (Human Early Learning Partnership, UBC). The scale measures communication in English, so it partly reflects children learning English.

Kindergarten readiness scores like these are teacher ratings, not speech diagnoses, and use different cut-offs in each province, so they should not be compared across provinces.

Does speech therapy work?

• A Cochrane review pooling 25 randomized trials found speech and language therapy effective for children with phonological (speech sound) difficulties, with a standardized effect of 0.44 (95% confidence interval 0.01 to 0.86), and for vocabulary difficulties (0.89). The trials in the review were published before 2003 (Law, Garrett & Nye, 2003).

• The companion meta-analysis found no significant difference between therapy delivered by trained parents and by clinicians, and pointed to therapy lasting longer than 8 weeks as a possible factor in good outcomes (Law et al., 2004).

• In an Ontario randomized trial, preschoolers with severe phonological disorders who received 4 months of therapy improved significantly on phonological measures compared with children still waiting (Almost & Rosenbaum, 1998).

• The USPSTF's 2024 review found 17 randomized trials (1,517 children) of speech and language interventions, none of which enrolled children found through routine screening, so the benefit of screening children without symptoms is unproven. That is a statement about screening, not about whether therapy works.

Speech delay statistics you should not cite

Frequently asked questions

What percentage of children have a speech delay?

About 6.9% of US children aged 3–17 currently have a speech or other language disorder (NSCH 2024), and 10.7% of children aged 3–5. Studies that test children directly for speech sound disorders find lower rates: 3.4% at age 4 and 3.8% at age 6.

How common is speech delay in 2-year-olds?

In US medical records, 16–17% of children have a speech delay diagnosis by their second birthday (Epic Research, 2023–2024). In a large Australian population study, 13.4% of 2-year-olds were late talkers, and many late talkers catch up.

Are speech delays more common in boys?

Yes. Boys are about 1.5 to 2 times as likely as girls to have a speech or language disorder: 9.1% vs 4.6% in the US (NSCH 2024). In Canada, 5.0% of boys and 2.7% of girls aged 2 to 4 have parent-reported difficulty being understood.

Do most children outgrow speech delays?

Clinic-based studies suggest about 70–75% of preschoolers with speech delay have normal speech by age 6. Still, about 3.6% of 8-year-olds have a persistent speech sound disorder, and 1–2% of young adults keep residual errors.

How common is a lisp?

We found no reliable US or Canadian figure for lisps. The best-known prevalence studies (Shriberg 1999, Wren 2016) left out distortions such as lisps. The closest estimate is that 1–2% of young adults have residual speech errors of any kind.

What sounds should a 4-year-old be able to say?

By their fourth birthday, most children produce b, n, m, p, h, w, d, g, k, f, t, ng and y correctly. Between ages 4;0 and 4;11, most add v, j, s, ch, l, sh and z; r and the th sounds come later (Crowe & McLeod, 2020).

How many Canadian children have a speech delay?

Statistics Canada reports that 3.9% of children aged 2–4 and 1.5% of those aged 5–17 had parent-reported difficulty understanding and being understood in 2023. We found no recent national study that tests Canadian children for speech sound disorders.

Did COVID-19 cause more speech delays?

Speech delay diagnoses rose sharply: US toddlers who turned two in early 2023 were 87.8% more likely to be diagnosed than those who turned two in 2018. Meta-analyses find about 1.7 times the odds of language and communication delay in children exposed to the pandemic.

Methodology and sources

We compiled these statistics on October 20, 2026, from government surveys, education data, peer-reviewed studies and professional bodies, and checked each figure against its original source. We give the year the data were collected, because many widely cited figures (including the NIDCD and NCHS numbers) come from the 2012 National Health Interview Survey. Calculations of our own are marked "by our calculation."

• NSCH and CHSCY figures are parent reports, not clinical diagnoses.

• Some of the best epidemiological studies are from Australia and the UK; we label their country each time.

• NSCH 2024 is the latest national estimate we verified; we will update this page with newer NSCH, IDEA and Statistics Canada releases.

To cite this page: Ga-loo (2026). Speech Delay and Speech Sound Disorder Statistics 2026 (US and Canada). https://ga-loo.com/blog/speech-delay-statistics

Related reading

• Speech therapy cost and wait time statistics: what therapy costs and how long families wait in the US and Canada.

• SLP statistics 2026: how many speech-language pathologists there are and how many students they serve.

• Phonological processes chart by age: which error patterns are typical at which age.

Nine in ten school SLPs treat children with speech sound disorders. Ga-loo helps SLPs turn each articulation goal into a fresh weekly practice pack, built from phonetically checked word lists by sound.