Developmental Language Disorder or a Slower Start? Helping Teachers Tell the Difference
There’s a pupil in most classes who doesn’t quite add up. They’re bright. They have ideas. But written work comes back thin, instructions need repeating, and when you ask them to explain their thinking, what comes out is much less than what you know is in there. They may be quiet in class, find it difficult to get started, or become frustrated when they can’t explain what they mean.
Some children are developing language at a slower rate and may catch up. Others have Developmental Language Disorder (DLD), a lifelong condition affecting roughly two children in every classroom of thirty. Telling the difference matters, because the support a pupil needs may be different, and the cost of guessing wrong falls on the child.
This article is for teachers and SENCos who want a practical way to think about that distinction before they refer.
Why DLD gets missed
DLD is common, but it has a low public profile. Many teachers have received substantial training on dyslexia and autism but much less on DLD.
It can also be difficult to spot. A child with DLD may have strengths in many areas, but experience persistent difficulties understanding and using language. They often develop excellent coping strategies: watching what peers do, answering in single words, staying quiet, or becoming the class clown. By the time these strategies stop working, often as the language demands of the curriculum increase, the pupil may be struggling to access learning and the reason can be missed.
Delay and disorder: what the difference actually means
A language delay is generally used to describe a child whose language development is following a similar path to that of their peers, but at a slower rate. With time and appropriate support, the gap may narrow.
DLD means language difficulties are persistent and are not simply explained by a slower developmental timetable. Pupils with DLD may continue to need support into secondary school and beyond. DLD can be identified alongside other conditions, so it is important not to assume that a pupil’s language needs are explained by another diagnosis.
The practical implication for a school is straightforward. Some children will make progress with time and good-quality classroom support. For others, difficulties will persist and more specialist assessment and support will be needed. It is not possible to make this distinction from classroom observations alone, but recognising the pattern early can help schools make an appropriate referral and put support in place.
What DLD looks like in the classroom
DLD affects understanding, expression, or both. These are some of the patterns teachers most often describe.
- Understanding: The pupil follows the first part of an instruction and loses the rest, or watches what the person next to them is doing. They may struggle with words such as before, after, unless and except, which carry a lot of meaning in a small package.
- Word finding: They visibly search for words they know, substitute vague words such as thing and stuff, or describe an object rather than name it.
- Sentence structure: Sentences may be shorter or less organised than expected for their age, with grammatical errors that persist over time.
- Narrative: Retelling a story or recounting an event comes out jumbled, with the ending first or key information missing, because sequencing and organising language is hard work.
- Vocabulary depth: They may recognise a word but find it harder to explain or use it themselves. This can show up particularly clearly in subject-specific vocabulary.
- Literacy: Reading comprehension may lag behind reading accuracy. A pupil can decode fluently but find it difficult to understand what they have read.
- Social and emotional presentation: They may be quiet, appear to agree without understanding, or become frustrated and disengage. These responses can reflect the effort involved in processing language in a busy classroom.
These signs do not automatically mean a pupil has DLD. The important thing is to look for a persistent pattern and consider how it affects their access to learning and participation.
What to check first
Before assuming DLD, consider other factors that can produce a similar picture and may require a different response.
- Hearing: Hearing difficulties, including fluctuating hearing associated with glue ear, can affect access to spoken language. If a child’s hearing has not been checked recently and there are concerns, discuss a hearing assessment with the family and appropriate health professionals.
- English as an additional language: A child learning English may show differences in their English language skills while they are acquiring the language. Consider their language development across all the languages they use, and seek advice from professionals with relevant expertise where needed. Multilingualism does not cause DLD, and difficulties across languages may indicate that further assessment would be helpful.
- Attention and listening: A busy classroom can make it harder for some children to process spoken information. Consider whether the pupil understands more when instructions are shorter, visual support is available, and distractions are reduced.
- Anxiety or situational silence: A child who speaks fluently at home but finds speaking difficult at school may need a different kind of support, for example if selective mutism is a possibility. Avoid assuming that a child who speaks less at school does not have the language skills to communicate.
- Environment: If several children in the class show similar difficulties, consider the language demands of the classroom and whether instructions, explanations and resources are accessible. Our article on the communication-friendly classroom sets out a twenty-minute audit for exactly this.
These factors are worth considering, but they should not become reasons to delay support when a pupil is struggling.
A quick classroom check
None of this is diagnostic, but it can help you build a clearer picture before making a referral. Over a fortnight, note what happens when you make three specific adjustments.
- Give an instruction in short chunks with a visual reference, rather than as one long sentence. Does the pupil find it easier to follow?
- Allow additional processing time after a question. Does the answer arrive when there is less time pressure?
- Ask the pupil to retell something they know well, one to one and without time pressure. Is the content there but the organisation difficult, or are they also struggling to find the words and information they need?
A pupil who responds well when the language load is reduced is giving you useful information about what helps them access learning. It does not rule DLD in or out, but it belongs in your referral and can help shape classroom support.
This is the point at which many schools stall, because the next step can feel like more work rather than less. It needn’t be. When we work with a school, we can help identify pupils whose communication needs may benefit from further assessment, advise on classroom adjustments, and support the assessment and reporting process. You do not need to be certain before you ask for advice.
When and how to refer
Consider a referral when the pattern persists across several weeks and contexts, when difficulties continue despite appropriate adjustments, or when there are concerns about the pupil’s understanding, expression, learning or participation. You do not need to wait until the end of the school year to see whether things improve.
Families can contact their local NHS speech and language therapy service, with referral routes varying by area. A GP, health visitor or school may be able to advise on the local pathway. Waiting times vary between boroughs. Families can also choose private assessment, and schools can commission a Speech and Language Therapist to assess pupils in school, which can be practical when several children in a year group need support.
An assessment can help a pupil, their family and their school understand their communication profile and identify appropriate support. It can also help move the conversation away from assumptions that a child is lazy, not trying or simply not listening, towards a clearer understanding of what makes learning accessible.
London Speech Therapy assesses and supports pupils with Developmental Language Disorder in schools across London, Kent and Essex, and runs staff training on identifying and supporting DLD in the classroom. If your provision feels stretched, email enquiries@londonspeechtherapy.co.uk or call 020 3475 2189.
