Speech and Language Norms for Age 4
Four is the year narrative begins. Children move from describing the present to telling short stories about the past, and complex sentence elements (conjunctions, embedded clauses) start to appear. Intelligibility should now be functionally complete to strangers — residual errors cluster around late-developing sounds, not phonological patterns.
Quick reference — age 4 norms
| Metric | Typical value at age 4 | Source |
|---|---|---|
| MLU (morphemes) | 4.4 (range 3.6–5.2) | Rice et al. 2010 / SUGAR 2017 |
| NDW per 100 words | 49 | Miller 1991 (SALT) |
| Type-Token Ratio | 0.47 | Templin 1957; Watkins 1995 |
| Percent Consonants Correct | 85% | Shriberg & Kwiatkowski 1982 |
| Intelligibility to strangers | 95% | Coplan & Gleason 1988; Hustad 2021 |
| Brown's stage | Brown's Stage IV to early Stage V | |
Values are central estimates. Individual variation is wide — a child who falls a little outside the typical range is not automatically delayed. Use these as one input alongside direct assessment.
Language milestones at 4
- Uses 4- to 5-word sentences routinely
- Tells simple 3- to 5-sentence stories with a beginning and middle
- Asks "why" and "how" questions
- Uses past tense -ed, though may over-regularise ("goed")
- Uses "because" and "and" to link ideas
- Relays an event from earlier in the day
Speech-sound milestones
- Acquires /f v j/ and most stops
- Phonological processes mostly resolved except /r/, /l/, /s/, /th/
- Cluster reduction largely gone
- Weak syllable deletion gone
Clinical guidance
At 4 the assessment question shifts from "is grammar emerging?" to "is the story structure intact?". Narrative sampling becomes more informative than short conversational sampling because it pulls in discourse-level skills — temporal sequencing, referencing, and causal links — that short dialogue hides. A story-retell task with a wordless picture book gives a richer sample in less time than free conversation. Four-year-olds with normal MLU but weak narrative structure often qualify for language services on pragmatic or narrative grounds even though their sentence-level grammar looks fine. This is also the year to start tracking fluency: normal disfluencies peak around 3-4 and typically fade; tension or multiple-unit repetitions warrant a fluency-specific evaluation.
“A kid who answers "what" perfectly but freezes on "why" has a narrative-reasoning problem, not a vocabulary problem. That profile is easy to miss at 4 because the answers to "what" questions sound age-appropriate.”
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Red flags at age 4
The items below warrant a referral to a speech-language pathologist for a full evaluation. Any single item is enough to justify a conversation — do not wait for multiple flags to stack up.
- MLU below 3.0 morphemes
- Intelligibility below 90% to strangers
- Cannot tell a 3-sentence story about something that happened
- Cannot answer "why" questions
- Persistent fronting or stopping of fricatives
Tools to use with this age group
Narrative Scoring Scheme (NSS) Calculator
Free interactive Narrative Scoring Scheme (NSS) calculator implementing the Heilmann, Miller, Nockerts, & Dunaway (2010) rubric for school-based and clinic speech-language pathologists scoring paediatric narrative language samples. Rate each of the seven NSS subscales (introduction, character development, mental states, referencing, conflict resolution, cohesion, conclusion) from 0 (immature / absent) to 5 (proficient) based on the child's story retell or personal narrative, and the calculator sums the subscale scores, classifies the total out of 35 against the published 5-11-year-old story-retell expectation band (15-28 of 35), and returns up to three intervention targets derived from the lowest-scoring subscales. Built for school SLPs, clinic SLPs, early-intervention teams, graduate SLP students, and paediatric language researchers. Mobile-friendly, client-side, no sign-up.
Open toolMLU 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 toolArticulation Screener
Free interactive articulation screener for speech-language pathologists. Tick errored sounds on a 30-word single-word probe covering every English consonant in at least one word position (initial, medial, final). The tool lists every errored sound, groups errors by position, and flags whether each sound is age-expected or past its McLeod & Crowe (2018) age of mastery — headline pass / at-cusp / refer decision in one keystroke. Modelled on the Goldman-Fristoe Test of Articulation 3 sounds-in-words structure and the Iowa-Nebraska norms (Smit et al. 1990). Mobile-friendly, client-side, no sign-up.
Open toolPhonological Process Identifier
Free interactive phonological process identifier for speech-language pathologists. Enter a target word and the child production and the calculator flags every matching process from the twelve most common English patterns (cluster reduction, fronting, stopping, gliding, vocalisation, weak syllable deletion, final consonant deletion, deaffrication, denasalisation, prevocalic voicing, devoicing, initial consonant deletion), each tagged with its Bowen (2015) age of suppression so you can see whether the production is age-expected or persistent. Mobile-friendly, client-side, no sign-up.
Open tool