Expressive Language Delay
Expressive language delay describes children whose spoken output lags behind age expectations while their receptive skills remain within the typical range.
What Expressive Language Delay is
Expressive language delay is the clinical picture of a child whose comprehension looks close to age expectation on informal probes but whose spoken output is demonstrably reduced — fewer words, shorter sentences, less grammatical variety. In toddlers the label "late talker" is sometimes used interchangeably; in older preschoolers the clinical presentation looks closer to the expressive profile of DLD. The distinction from a broader developmental language disorder matters because children whose deficit is limited to expression tend to have a better prognosis, particularly when intervention begins before age 3.
Prevalence
Late talkers make up roughly 10–20% of 2-year-olds in community samples (Rescorla 1989; Zubrick et al. 2007); about half of that group catches up by school entry without any intervention, which is why short-term monitoring is routine.
Diagnostic criteria and defining features
- Expressive vocabulary below the 10th percentile for age on a normed inventory (e.g., MCDI) or clinical judgement
- Fewer than 50 single words or no two-word combinations at 24 months
- Receptive language broadly within normal limits on a standardised measure
- No hearing loss, neurological diagnosis, or autism as the explanation
Criteria summarised from DSM-5-TR, ICD-11, and ASHA practice guidance. Always cross-reference against the diagnostic manual of record before using in a report.
Clinical presentation
Late talkers are almost always delightful to observe — they understand the routine, make appropriate eye contact, gesture richly, and engage with toys in age-typical ways. The deficit only becomes visible when the clinician waits for spoken output. The expressive profile in the preschool years looks similar: short utterances, a narrow vocabulary, and morphological simplification. In the clinic, the most reliable marker is a disparity of one or more standard deviations between receptive and expressive standardised scores. Families often report that "he understands everything I say but barely talks" — that observation is itself a screening prompt worth acting on. Intonation, pragmatic behaviours, and play are typically intact.
“The mother who says "he understands everything but barely talks" is almost always right about the comprehension side and almost always right about the expression side. Believe her, take the language sample, and compare the two columns on the report.”
How language sample analysis contributes
An expressive-focused language sample is short and fast to collect because you are measuring what the child produces, not what they understand. Grab 15-20 minutes of play with preferred toys and run MLU-M, MLU-W, NDW in 50 utterances, and TTR. Compare the child's expressive metrics against age expectation using SUGAR or SALT norms. The classic finding is MLU and NDW both well below the 10th percentile while a structured receptive probe (pointing to named pictures) is age-appropriate. Annotate the sample with speech-sound errors too — children with expressive delay often carry co-occurring phonological immaturity that reinforces low intelligibility.
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Free tools for Expressive Language Delay
MLU Calculator
Paste a language sample and get Mean Length of Utterance in morphemes and words, total utterances, total morphemes, and the matching Brown's stage. Implements Brown (1973) morpheme counting rules and runs entirely in your browser.
Open toolSpeech-Language Milestones Checker
Free interactive speech-language milestones checker for children from birth to 72 months (6 years). Enter the child's age in months and tick the receptive (understanding) and expressive (use) communication milestones they have met. The tool classifies the current age band as on track, monitor, or refer for evaluation against the ASHA communication milestones (2024), the CDC "Learn the Signs. Act Early." revised milestones (Zubler et al. 2022 Pediatrics), the Bright Futures 4th ed. well-child developmental surveillance schedule, and the Ages & Stages Questionnaires 3rd ed. Built for paediatricians, early interventionists, school-based SLPs, developmental paediatricians, Head Start teachers, and parents. Mobile-friendly, client-side, no sign-up.
Open toolLexical Diversity Calculator
Paste a language sample and get type-token ratio (TTR), number of different words in the first 100 tokens (NDW-100, Miller 1981), and NDW per 50 utterances (NDW-50, SUGAR). Implements the standard SALT/SUGAR tokenisation rules and runs entirely in your browser.
Open toolRelated disorders
Developmental Language Disorder (DLD)
Developmental language disorder is a persistent language impairment that is not explained by another medical condition and affects roughly 1 in 14 children.
PediatricReceptive Language Disorder
Receptive language disorder is a persistent impairment in understanding spoken language that is not better explained by hearing loss or another medical condition.
PediatricMixed Receptive-Expressive Language Disorder
A mixed profile describes children whose comprehension and production are both impaired — the most common presentation under the DLD umbrella.
References
- Rescorla, L. (1989). The Language Development Survey: A screening tool for delayed language in toddlers. JSHD, 54(4), 587–599.
- Zubrick, S. R., Taylor, C. L., Rice, M. L., & Slegers, D. W. (2007). Late language emergence at 24 months: An epidemiological study of prevalence, predictors, and covariates. JSLHR, 50(6), 1562–1592.
- Desmarais, C., Sylvestre, A., Meyer, F., Bairati, I., & Rouleau, N. (2008). Systematic review of the literature on characteristics of late-talking toddlers. International Journal of Language & Communication Disorders, 43(4), 361–389.