Babies born into the first COVID-19 lockdown were markedly less likely to talk on schedule: 76.6% had one definite and meaningful word at 12 months, against 89.3% of a pre-pandemic cohort, and by age 2, 11.9% scored below the communication cut-off for developmental concern versus 5.4% (Byrne et al., Archives of Disease in Childhood, 2023). The signal did not fade with reopening: in Okayama, Japan, the risk that an 18-month-old needed language follow-up was 1.19 times higher across 2020-2024 than before the pandemic, and higher in the late period than the early one. Against that backdrop, the baseline was already high: 11.0% of US children aged 3-6 had a communication disorder in the last national data brief, and speech, language and communication needs are now the most common primary need among pupils on SEN support in England (25.7%). The policy response is now measured in early intervention counts and school-readiness targets, and the clinical side is covered in our speech therapy statistics. We aggregated data from the CDC’s National Center for Health Statistics, NIDCD, the UK Department for Education, the Office for Health Improvement and Disparities, Ofsted, the ECTA Center, NCES and peer-reviewed cohort studies in Archives of Disease in Childhood, JAMA Pediatrics, Developmental Psychology and Child Development.
TL;DR
- 7.7% of US children aged 3-17 had a communication disorder, 11.0% at ages 3-6 (NCHS Data Brief 205, 2012 data).
- 1 in 14 US children aged 3-17 (7.2%) had a voice, speech or language disorder in the past 12 months (NIDCD, 2015 NHIS data).
- Language disorder affected 9.92% of 4-5 year olds at school entry in a Surrey population study (Norbury et al., JCPP 2016).
- Lockdown-born Irish babies: 76.6% had a first word at 12 months vs 89.3% pre-pandemic (Byrne et al., Arch Dis Child 2023).
- At 24 months, 11.9% of the same cohort fell below the ASQ communication cut-off vs 5.4% (Byrne et al., Arch Dis Child 2023).
- 25% of CORAL infants had not met a child their own age by their first birthday (Byrne et al., Arch Dis Child 2023).
- Japan: risk of needing language follow-up at 18 months rose to 1.19 times the pre-pandemic level in 2020-2024 (Matsuo et al., Arch Dis Child 2026).
- Dutch 2- and 3-year-olds assessed after the pandemic had smaller vocabularies than pre-pandemic peers (YOUth cohort, Developmental Psychology 2026).
- England: 86.6% of 2-2.5 year olds met the communication benchmark in 2023-24; 80.4% met all five areas vs 83.3% in 2019-20 (OHID).
- 25.7% of English pupils on SEN support have speech, language and communication needs as their primary need (DfE, SEN in England 2025/26).
- 441,515 US infants and toddlers had an early intervention plan in FFY 2023, 4.01% of the population (ECTA Center, OSEP data).
- Each extra minute of screen time at 36 months was linked to 6.6 fewer adult words heard (Brushe et al., JAMA Pediatrics 2024).
1. Baseline Prevalence: The Pre-Pandemic Reference Point
Any claim about a pandemic effect needs a baseline, and the US one is old but large. 11.0% of US children aged 3-6 had a communication disorder in the previous 12 months, the highest rate of any age band (NCHS Data Brief 205). Across all children aged 3-17 the rate was 7.7%, with speech problems (5.0%) the most common type and swallowing problems (0.9%) the least. Most recent available data: NCHS, 2012 NHIS supplement; NIDCD’s follow-on figure uses 2015 data.
The shape matters more than the headline. Rates halve between preschool and adolescence (11.0% at 3-6, 4.9% at 11-17), which is consistent with many early delays resolving and with the remaining cases becoming persistent disorders. Boys are flagged far more often than girls (9.6% vs 5.7%), and one third of children aged 3-10 with a communication disorder had more than one type. The NIDCD summary of 2015 data lands in the same range: about 1 in 14 children, 7.2%, with 10.8% at ages 3-6 (NIDCD, Quick Statistics About Voice, Speech, Language).
| Metric | Value | Source |
|---|---|---|
| Children 3-17 with a communication disorder, past 12 months | 7.7% | NCHS Data Brief 205 (2012 data) |
| Children 3-6 with a communication disorder | 11.0% (7-10: 9.3%; 11-17: 4.9%) | NCHS Data Brief 205 (2012 data) |
| Speech problems, children 3-17 | 5.0% (swallowing 0.9%) | NCHS Data Brief 205 (2012 data) |
| Boys vs girls | 9.6% vs 5.7% | NCHS Data Brief 205 (2012 data) |
| Children 3-10 with more than one disorder type | One third (one fourth at 11-17) | NCHS Data Brief 205 (2012 data) |
| Voice, speech or language disorder, children 3-17 | 7.2% (about 1 in 14) | NIDCD Quick Statistics (2015 NHIS) |
| By age, NIDCD | 10.8% at 3-6, 4.3% at 11-17 | NIDCD Quick Statistics (2015 NHIS) |
| By race and ethnicity | Black 8.9%, White 7.3%, Hispanic 6.4% | NIDCD Quick Statistics (2015 NHIS) |
Context note: the newer NCHS developmental disability series (2019-2021) does not isolate speech or language, but it shows the “other developmental delay” category rising from 5.08% to 6.06% of children aged 3-17, and 6.58% at ages 3-7 (NCHS Data Brief 473). Autism, which often presents first as a language delay, is tracked in our autism prevalence statistics.
2. Developmental Language Disorder: The Persistent Core
Many late talkers catch up; developmental language disorder (DLD) is the group that does not. The first UK population study of language impairment at school entry estimated that 9.92% of 4-5 year olds had a language disorder, and 7.58% had one of unknown origin, the profile now called DLD (Norbury et al., Journal of Child Psychology and Psychiatry, 2016). The authors translate it into a classroom: about two children in every class of 30. The functional cost is the striking part: 88% of children with language disorder did not make expected academic progress. Most recent available data for England: Norbury et al., 2016.
Independent cohorts on three continents land in a similar band. Australia’s Raine Study found 6.4% of 10-year-olds met DLD criteria, most often with combined receptive-expressive deficits (Calder et al., Journal of Paediatrics and Child Health, 2022), and the first population estimate for Mandarin-speaking children was 8.5% (Wu et al., Lancet Regional Health Western Pacific, 2023). The outlier is a 2026 West Virginia school screen in which 28.6% of early-elementary students met at-risk criteria, a reminder that “risk” screens and diagnostic prevalence are different measures, and that the test chosen moved the estimate (Israelsen-Augenstein et al., LSHSS, 2026).
| Metric | Value | Source |
|---|---|---|
| Language disorder at school entry (ages 4-5) | 9.92% (95% CI 7.38-13.20) | Norbury et al., JCPP 2016 |
| Language disorder of unknown origin (DLD) | 7.58% (95% CI 5.33-10.66) | Norbury et al., JCPP 2016 |
| With intellectual disability or medical diagnosis | 2.34% | Norbury et al., JCPP 2016 |
| Children with language disorder not making expected academic progress | 88% | Norbury et al., JCPP 2016 |
| DLD at age 10, Raine Study (n = 1,626) | 6.4% (receptive-expressive 46.2%, expressive 33.7%, receptive 20.2%) | Calder et al., J Paediatr Child Health 2022 |
| DLD among Mandarin-speaking children | 8.5% (95% CI 6.3-11.5) | Wu et al., Lancet Reg Health West Pac 2023 |
| Early-elementary students at risk for DLD, West Virginia | 28.6% (72 of 252) | Israelsen-Augenstein et al., LSHSS 2026 |
Context note: in the Raine cohort, in-utero smoke exposure at 18 weeks’ gestation was linked to higher DLD risk (OR 2.56). The Surrey study screened 7,267 of 12,398 eligible children (59%) in 161 schools, and its estimates are sample-weighted. The Wu study linked DLD to lower parent-child interaction diversity and lower kindergarten quality, two factors that pandemic closures also disrupted.
3. Lockdown Babies: First-Year Milestones and the Age-2 Check
The cleanest natural experiment comes from Ireland’s CORAL cohort, babies born in the first three months of the pandemic. At 12 months, 76.6% had one definite and meaningful word, compared with 89.3% of a historical cohort, an adjusted relative risk of 0.86 (Byrne et al., Archives of Disease in Childhood, 2023). Pointing (83.8% vs 92.8%) and waving bye-bye (87.7% vs 94.4%) lagged too, while motor milestones did not: 97.4% of CORAL babies could crawl versus 91.0% in the comparison group. The deficit was social communication, not general development.
The social context explains the pattern. CORAL families reported a median of one social contact outside the home at birth, and 25% of infants had not met a child their own age by their first birthday. At 24 months the gap persisted on a standardised tool: mean ASQ communication scores were 49.5 versus 53.7, and 11.9% of pandemic-born toddlers fell below the cut-off for developmental concern versus 5.4% (Byrne et al., Archives of Disease in Childhood, 2023). Fine motor, problem-solving and personal-social scores were similar, which narrows the effect to language.
| Metric | Value | Source |
|---|---|---|
| One definite word at 12 months | 76.6% CORAL vs 89.3% pre-pandemic (RR 0.86) | Byrne et al., Arch Dis Child 2023 (12-month) |
| Pointing at 12 months | 83.8% vs 92.8% (RR 0.91) | Byrne et al., Arch Dis Child 2023 (12-month) |
| Waving bye-bye at 12 months | 87.7% vs 94.4% (RR 0.94) | Byrne et al., Arch Dis Child 2023 (12-month) |
| Infants who had not met a same-age child by age 1 | 25% | Byrne et al., Arch Dis Child 2023 (12-month) |
| ASQ communication score at 24 months | 49.5 vs 53.7 (p<0.01) | Byrne et al., Arch Dis Child 2023 (24-month) |
| Below communication cut-off for concern at 24 months | 11.9% vs 5.4% | Byrne et al., Arch Dis Child 2023 (24-month) |
| Below 1 SD (monitoring zone) at 24 months | 18.9% vs 9.9% | Byrne et al., Arch Dis Child 2023 (24-month) |
| Cohort sizes | 309 vs 1,629 at 12 months; 312 vs 605 at 24 months | Byrne et al., Arch Dis Child 2023 |
Context note: milestones at 12 months were parent-reported and the comparison cohort was recruited in 2008-2011, limitations the authors flag. In New York, a separate cohort found infants born during the pandemic scored lower on gross motor, fine motor and personal-social ASQ-3 subdomains at 6 months, while in-utero exposure to maternal SARS-CoV-2 infection was not associated with differences (Shuffrey et al., JAMA Pediatrics, 2022).
4. The Long Tail: Japan, the Netherlands, Greece and North America
If lockdown effects were temporary, they should shrink as restrictions lifted. Japan’s data say the opposite. In Okayama City, the share of 18-month-olds requiring language follow-up rose from 33.5% before the pandemic to 36% during it, an adjusted risk ratio of 1.09 across 33,484 children (Matsuo et al., Archives of Disease in Childhood, 2024). An extended analysis of 39,840 children through March 2024 found the ratio climbing to 1.19, with higher ratios in the late period (April 2022-March 2024) than the early one (Matsuo et al., Archives of Disease in Childhood, 2026). Effects were stronger in girls and in children cared for at home rather than in nursery.
Europe shows the same direction. In the Dutch YOUth cohort of 2,166 children, 2- and 3-year-olds assessed after COVID-19 regulations had smaller vocabularies than pre-pandemic peers, and preschool screen time “rose sharply” and was negatively linked to receptive vocabulary (van der Klis and Junge, Developmental Psychology, 2026). A Greek screening project found 42% of 2-4 year olds screened after the pandemic had an atypical language profile (Kyvrakidou et al., Children, 2025). In North America, income was the dividing line: lower-income Canadian 19-29 month olds fared worse on vocabulary during the pandemic while middle- and high-income children showed no measurable change (Fung et al., Journal of Experimental Child Psychology, 2023), and US Early Head Start children (N = 2,763) showed declines in parent-reported language skills and lags in vocalization growth through 2025 (Lee, Lynch and Loeb, Child Development, 2026).
| Metric | Value | Source |
|---|---|---|
| 18-month-olds needing language follow-up, Okayama | 33.5% pre-pandemic vs 36% during (RR 1.09) | Matsuo et al., Arch Dis Child 2024 |
| Extended risk ratio, 2020-2024 (n = 39,840) | 1.19 for follow-up; 1.16 for fewer than 3 meaningful words | Matsuo et al., Arch Dis Child 2026 |
| Dutch YOUth cohort, 5 months to 4 years | 2,166 children; smaller vocabularies at ages 2 and 3 post-pandemic | van der Klis and Junge, Dev Psychol 2026 |
| Greek preschoolers with atypical language profile, post-pandemic | 42% (n = 213 across three periods) | Kyvrakidou et al., Children 2025 |
| Canadian infants and toddlers compared | 539 pandemic vs 1,365 pre-pandemic; lower-income 19-29 month olds fared worse | Fung et al., J Exp Child Psychol 2023 |
| US Early Head Start children, pre-COVID to 2025 | 2,763; declines in parent-reported language | Lee, Lynch and Loeb, Child Dev 2026 |
| Quebec pandemic-born children tracked to 29 months | 2,664; COVID stressors linked indirectly to communication skills | Julien et al., Infancy 2026 |
Context note: the Greek sample is small (62 before, 50 during and 101 after the pandemic), and its overall atypical rate was 38.3%; the period difference was significant only in girls. The Quebec study traced the pathway through parental depressive symptoms and parenting cognitions, not lockdown alone (Julien et al., Infancy, 2026).
5. England’s Early Years Data: Recovery, Not Repair
England publishes the most complete population data on toddler development, and it shows partial recovery. In 2023-24, 86.6% of children reviewed at 2 to 2 and a half years reached the expected level in communication skills, the lowest of the five ASQ-3 areas, and 80.4% reached it in all five, still below the 83.3% recorded in 2019-20 (OHID, Child development outcomes at 2 to 2 and a half years, 2023 to 2024). Gross and fine motor skills were both at 93.3%, so communication is the clear weak spot. The gap between the most and least deprived local authorities widened from 3.9 to 6.4 percentage points.
By age 5 the picture is a policy target. 68.3% of children reached a good level of development in 2024/25 (DfE, EYFS Profile results 2024/25), against a government goal of 75% by 2028 (DfE, Giving every child the best start in life, July 2025). The free school meals gap (51.3% vs 72.5%) is wider than the pandemic dip. Early education access is part of the fix, as our pre-K enrollment statistics show for the US.
| Metric | Value | Source |
|---|---|---|
| 2-2.5 year olds at expected level in communication, 2023-24 | 86.6% (+1.3 points) | OHID, Child development outcomes 2023 to 2024 |
| At expected level in all five areas | 80.4% (79.2% in 2022-23; 83.3% in 2019-20) | OHID, Child development outcomes 2023 to 2024 |
| Coverage of the 2-2.5 year review | 78.4% reviewed; 93.3% of those with a completed ASQ-3 | OHID, Child development outcomes 2023 to 2024 |
| Deprivation gap, all five areas | 6.4 points (3.9 in 2022-23) | OHID, Child development outcomes 2023 to 2024 |
| Good level of development at age 5, 2024/25 | 68.3% (589,500 children assessed) | DfE, EYFS Profile results 2024/25 |
| Girls vs boys | 75.3% vs 61.6% | DfE, EYFS Profile results 2024/25 |
| FSM-eligible vs not eligible | 51.3% vs 72.5% | DfE, EYFS Profile results 2024/25 |
| Government target | 75% good level of development by 2028 | DfE, Giving every child the best start in life (2025) |
Context note: 66.9% of children were at the expected level across all 17 early learning goals in 2024/25. The EYFS Profile was reformed in September 2021, so results cannot be compared directly with pre-pandemic years. The 2024/25 Speaking goal rose 0.4 points partly because the framework now allows non-speaking communication such as signing to count.
6. Identification, Early Intervention and Service Capacity
Delays only matter for outcomes if children reach services, and US early intervention took a visible pandemic hit. The IDEA Part C point-in-time count of infants and toddlers with an Individualized Family Service Plan fell from 427,234 (3.70% of the population) in FFY 2020 to 363,387 (3.20%) in FFY 2021, then rebounded to a record 441,515 (4.01%) in FFY 2023 (ECTA Center, Part C national program data, from OSEP Section 618 data). The long-run trend is steady growth: 1.77% of the population was served in FFY 1991.
Access has long been uneven. Only 55.2% of children with a communication disorder received intervention services in the NHIS supplement, 60.1% of non-Hispanic White children versus 45.8% of Black and 47.3% of Hispanic children (NCHS Data Brief 205, 2012 data). In school-age special education, speech or language impairment is the second-largest category: 1,430,000 students aged 3-21, 19.0% of all IDEA Part B students, in 2022-23 (NCES, Digest Table 204.30). In England, speech, language and communication needs are the most common primary need on SEN support, 25.7%, and 22.1% among EHC plan holders (DfE, Special educational needs in England 2025/26). Identification trends in US schools are broken down in our special education IEP statistics.
| Metric | Value | Source |
|---|---|---|
| Infants and toddlers with an IFSP, FFY 2023 | 441,515 (4.01% of population) | ECTA Center, OSEP Section 618 data |
| Pandemic dip, FFY 2020 to FFY 2021 | 427,234 (3.70%) to 363,387 (3.20%) | ECTA Center, OSEP Section 618 data |
| Infants and toddlers served, FFY 1991 | 194,363 (1.77%) | ECTA Center, OSEP Section 618 data |
| Children with a communication disorder receiving intervention | 55.2% (ages 3-6: 59.8%; 11-17: 42.6%) | NCHS Data Brief 205 (2012 data) |
| Intervention receipt by race and ethnicity | White 60.1%, Hispanic 47.3%, Black 45.8% | NCHS Data Brief 205 (2012 data) |
| IDEA Part B students with speech or language impairment, 2022-23 | 1,430,000 (19.0% of IDEA students; 21.7% in 2010-11) | NCES, Digest Table 204.30 |
| SLCN as primary need, England, 2025/26 | 25.7% of SEN support; 22.1% of EHC plans | DfE, SEN in England 2025/26 |
| Wait for speech and language therapy reported by providers | Up to 9 months in some local authorities | Ofsted, Education recovery in early years providers (2022) |
Context note: Ofsted’s spring 2022 briefing drew on 70 early years providers, many of whom reported “delays in babies’ and children’s speech and language development” (Ofsted, April 2022). Screening tools changed too: the 2022 CDC and AAP milestone revision now uses milestones that 75% or more of children reach, cutting 26.4% of previous milestones and replacing 40.9%, partly to discourage a wait-and-see approach (Zubler et al., Pediatrics, 2022). Speech and Language UK, which says two million UK children are struggling with talking and understanding words, will train 36 Early Language Leads for the DfE through March 2028 (Speech and Language UK, September 2026).
7. The Home Language Environment: Screens, Stress and Speech Exposure
The mechanism most studies point to is fewer conversations, not the virus. At 36 months, each additional minute of screen time was associated with 6.6 fewer adult words, 4.9 fewer child vocalizations and 1.1 fewer conversational turns in 220 Australian families recorded with speech-recognition devices (Brushe et al., JAMA Pediatrics, 2024). The authors call it “technoference”: screens displace talk. In a Guangzhou clinic study of 2,100 children aged 18-72 months, 53.29% had more than 1 hour of daily screen exposure, with a dose-response link to language delay that was stronger among children who had been quarantined (Liu et al., BMC Public Health, 2025). Our children’s screen time statistics track how much exposure has grown.
The cleanest measurement of lost speech exposure comes from cochlear implant datalogs, which record what children hear hour by hour. Before the pandemic, children were exposed to speech for about 50% of implant use time; school-aged children lost 12.1% (bilateral) and 15.5% (unilateral) of that exposure in the early pandemic and had not fully recovered later (Wener et al., JAMA Network Open, 2023).
| Metric | Value | Source |
|---|---|---|
| Adult words lost per extra screen minute, age 36 months | 6.6 | Brushe et al., JAMA Pediatrics 2024 |
| Child vocalizations and conversational turns lost per minute | 4.9 vocalizations; 1.1 turns | Brushe et al., JAMA Pediatrics 2024 |
| Children 18-72 months with more than 1 hour of daily screen time | 53.29% (n = 2,100) | Liu et al., BMC Public Health 2025 |
| Pre-pandemic speech exposure, cochlear implant users | About 50% of device use time | Wener et al., JAMA Netw Open 2023 |
| Early-pandemic drop in speech exposure, school-aged CI users | -12.1% bilateral; -15.5% unilateral | Wener et al., JAMA Netw Open 2023 |
| Late-pandemic drop | -5.3% bilateral; -11.2% unilateral | Wener et al., JAMA Netw Open 2023 |
| Lower-income vs higher-income toddlers | Screen and reading time most negatively affected in lower-income families | Fung et al., J Exp Child Psychol 2023 |
Context note: the cochlear implant study covered 262 children and 2,746 datalogs in Toronto from 2018 to 2021. The YOUth cohort found shared reading supported vocabulary, but no evidence that shared reading increased during the pandemic. All studies in this section are observational and show association, not causation.
Summary: Early Childhood Speech and Language Delay by the Numbers
| Metric | Value | Source |
|---|---|---|
| US children 3-6 with a communication disorder | 11.0% | NCHS Data Brief 205 (2012 data) |
| US children 3-17 with a voice, speech or language disorder | 7.2% (1 in 14) | NIDCD (2015 NHIS) |
| Language disorder at school entry, England | 9.92% (DLD 7.58%) | Norbury et al., JCPP 2016 |
| DLD at age 10, Australia | 6.4% | Calder et al., 2022 |
| DLD among Mandarin-speaking children | 8.5% | Wu et al., 2023 |
| First word at 12 months, lockdown-born vs pre-pandemic | 76.6% vs 89.3% | Byrne et al., Arch Dis Child 2023 |
| Below ASQ communication cut-off at 24 months | 11.9% vs 5.4% | Byrne et al., Arch Dis Child 2023 |
| Infants who had not met a same-age child by age 1 | 25% | Byrne et al., Arch Dis Child 2023 |
| 18-month-olds needing language follow-up, Japan | 33.5% pre vs 36% during pandemic | Matsuo et al., 2024 |
| Extended pandemic risk ratio, Japan 2020-2024 | 1.19 | Matsuo et al., 2026 |
| Greek preschoolers with atypical profile post-pandemic | 42% | Kyvrakidou et al., 2025 |
| England, communication at expected level at 2-2.5 | 86.6% | OHID, 2023 to 2024 |
| England, all five areas at 2-2.5 | 80.4% (83.3% in 2019-20) | OHID, 2023 to 2024 |
| England, good level of development at age 5 | 68.3% (target 75% by 2028) | DfE, EYFSP 2024/25 |
| SLCN share of SEN support, England | 25.7% | DfE, SEN in England 2025/26 |
| US infants and toddlers in early intervention, FFY 2023 | 441,515 (4.01%) | ECTA Center, OSEP data |
| Communication-disordered children receiving services | 55.2% | NCHS Data Brief 205 (2012 data) |
| IDEA students with speech or language impairment | 19.0% (1.43 million) | NCES Digest Table 204.30 |
| Adult words lost per extra screen minute at 36 months | 6.6 | Brushe et al., JAMA Pediatrics 2024 |
Methodology and Sources
Every figure above was read during research for this article in a government statistical release, an agency data page or a peer-reviewed abstract or full text (retrieved via Europe PMC). Study results are reported as published, including confidence intervals and risk ratios where the authors gave them; no figures were combined or estimated. Cohort studies show associations and most use parent-reported screening tools.
- CDC National Center for Health Statistics: Data Brief 205, Communication disorders and use of intervention services among children aged 3-17; Data Brief 473, Diagnosed developmental disabilities in children aged 3-17, 2019-2021
- NIDCD: Quick Statistics About Voice, Speech, Language
- Prevalence studies: Norbury et al., JCPP 2016; Calder et al., Journal of Paediatrics and Child Health 2022; Wu et al., Lancet Regional Health Western Pacific 2023; Israelsen-Augenstein et al., LSHSS 2026
- Pandemic cohorts: Byrne et al., CORAL 12-month, Arch Dis Child 2023; Byrne et al., CORAL 24-month, Arch Dis Child 2023; Shuffrey et al., JAMA Pediatrics 2022; Matsuo et al., Arch Dis Child 2024; Matsuo et al., Arch Dis Child 2026; van der Klis and Junge, Developmental Psychology 2026; Kyvrakidou et al., Children 2025; Fung et al., J Exp Child Psychol 2023; Lee, Lynch and Loeb, Child Development 2026; Julien et al., Infancy 2026
- Home language environment: Brushe et al., JAMA Pediatrics 2024; Liu et al., BMC Public Health 2025; Wener et al., JAMA Network Open 2023
- Screening tools: Zubler et al., Evidence-Informed Milestones for Developmental Surveillance Tools, Pediatrics 2022
- England: OHID, Child development outcomes at 2 to 2 and a half years, 2023 to 2024; DfE, EYFS Profile results 2024/25; DfE, Special educational needs in England 2025/26; DfE, Giving every child the best start in life (2025); Ofsted, Education recovery in early years providers, spring 2022; Speech and Language UK, September 2026
- US early intervention and special education: ECTA Center, Part C national program data; NCES Digest Table 204.30
- Data watch: The US communication disorder prevalence figures are old (most recent available data: NCHS 2012 and NIDCD 2015 NHIS); no newer federal estimate isolating speech and language in young children was found. ECTA labels Part C counts by federal fiscal year as point-in-time fall counts, so the FFY 2020 to FFY 2021 drop should be read with ECTA’s labeling. NCES Digest Table 204.40 shows IDEA Part B children aged 3-5 falling from 818,575 (2018-19) to 494,888 (2020-21) and 527,163 (2022-23), but from 2020-21 states reported 5-year-olds in kindergarten in the 5-21 group, so that series was not used as a pandemic indicator. The CORAL 24-month abstract reports 5.4% of the pre-pandemic cohort below the communication cut-off while the full-text table shows 5.3% (32/605); this article uses the abstract figure. The Greek, West Virginia and Quebec studies are small or regional, and two Saudi community studies reporting 35.9% and 45.5% rates were excluded because they rely on broad parent-report screens. OHID’s 2023-24 release is the latest 2-2.5 year data found; the EYFS Profile cannot be compared with pre-2021 results. Speech and Language UK’s two million figure is stated without methodology on its pages. ASHA, AEDC (Australia), HRSA NSCH and some Speech and Language UK pages returned 403 errors and were not used; web search was unavailable, so all sources were fetched directly.
Last updated: October 3, 2026. We update this roundup quarterly, and the next refresh is expected when OHID publishes its 2024-25 child development outcomes at 2 to 2 and a half years and NCHS releases new NHIS developmental disability estimates.