Lisp in the Classroom: A Guide for Teachers and Parents

Lisp in the classroom: the short answer

By the time children start school, most already say S and Z clearly. A review of 15 U.S. studies of children’s consonant acquisition found /s/ and /z/ were acquired by 4;0–4;11 (years;months) at the 90% criterion, meaning that, averaged across the studies, nine in ten children said them correctly by that age. The voiceless “th” sound comes later, at 6;0–6;11.⁹

So a lisp in a school-age child is usually past the typical window. A clinician-authored reference (2011, not peer-reviewed) describes a tongue-forward (interdental) or dentalized S as normal for some children until about 4½, with assessment by a speech-language pathologist (SLP) indicated after that. A lateral lisp, where the S sounds wet or slushy, and a palatal lisp are not part of typical development at any age.¹⁰

Published ages do vary. The same U.S. review notes that studies differ in their tests, criteria and the children sampled; at the 90% criterion, individual studies placed /s/ anywhere from age 2 to age 7. The “4½” figure is a clinician’s rule of thumb, which is a different measure from the 90% norm.^9,10

Whether a school provides speech help depends on more than the sound itself. In the U.S., the law covers impaired articulation that adversely affects a child’s educational performance. In England, the SEND Code of Practice says identifying a need is about deciding what action the school takes, not fitting a pupil into a category. In both, a teacher’s report of how the child takes part in class can feed into assessment.^1,13,4

What school speech services cover for a lisp

An articulation difference such as a lisp can be within the scope of school support, but it does not qualify automatically. The rules differ by country, and within a country by state or local service.^2,15

United States: IDEA, IEPs and 504 plans

Under the IDEA regulations, a “speech or language impairment” includes “impaired articulation” that adversely affects a child’s educational performance. A U.S. Department of Education-funded parent center gives a lisp as an example of an articulation impairment.^1,8

The school’s IEP team decides eligibility after a full evaluation, working through three questions:²

1. 1Is there a disability?
2. 2Does it adversely affect educational performance?
3. 3Is specially designed instruction or a related service needed?

Educational performance is not only grades. ASHA points to U.S. Department of Education letters from 1980 and 2007, reaffirmed in 2023, saying it is not limited to academics, and adverse effect is judged case by case. Schools may interpret “adverse effect” differently, but they cannot refuse services only because a child has no academic gap.^2,3

That cuts both ways. Eligibility needs a disability, an educational impact and a need for services together, and the school must weigh information from a variety of sources, so a private diagnosis is useful information but doesn’t settle the question on its own. State eligibility guidelines also vary, and ASHA keeps a state-by-state map.^2,3

Social impact can count too. An article in an ASHA special interest group journal argues that social impact assessments are often overlooked in speech sound evaluations, and uses three hypothetical school cases, one of them a child with a lateral lisp, to show how each child could qualify for services based on social impact.⁷

If a child doesn’t qualify for an IEP, support may still be available in general education through a multi-tiered system of supports (MTSS or RTI), and possibly through a Section 504 plan.^4,5

England: the SEND Code and local NHS services

The SEND Code of Practice (2015) places speech, language and communication needs under “Communication and interaction”, and says the purpose of identifying a need is to work out what action the school needs to take, not to fit a pupil into a category. Schools use a graduated approach, a four-part cycle of support (assess, plan, do, review) built around the child’s needs.^13,14

NHS speech and language therapy is arranged locally, and referral criteria differ between trusts. One trust’s undated criteria say therapy for lisps and lateral S is generally not undertaken until a child has good awareness, self-monitoring and the motivation to change, which can be around ages 7–10, and it does not accept secondary-age referrals except in a few situations such as stammering, voice difficulties or severe hearing loss. Another trust, in Essex, lets schools discuss concerns with their link speech and language therapist, and lists interdental lisps (S said as “th”) among the referrals it does not accept. A third asks the school to complete a teacher questionnaire on impact.^15,16,17

These local rules sit awkwardly beside clinical advice to assess a lateral or palatal lisp without delay. The two can fit together (assessment now, therapy later), but services genuinely differ, so it helps to ask the local service how it handles lisps and whether it has age limits before secondary school.^15,10

Australia, India and the rest of the UK

• We have not yet verified official sources for school speech services in Australia or India, so this page does not describe their rules.
• Scotland, Wales and Northern Ireland have their own frameworks; the England section above may not apply.
• In any of these places, ask the school what support it offers and how referrals work locally.
• For assessment, talk to a qualified speech pathologist (Australia), speech-language pathologist (India) or speech and language therapist (UK).

• Speech therapy in Australia
• Speech therapy in India
• Speech therapy in the UK

What a teacher can do in class

Peers do notice speech differences. In a 1991 study, 348 fourth and sixth graders rated videotaped peers with mild speech errors (R errors, or S and Z errors) significantly more negatively than peers without errors, which is a good reason to keep attention on what a child says rather than how they say it.¹¹

The evidence for specific classroom strategies is thin: we found no trials of these habits for children with a lisp. Treat the list below as sensible general practice, with the details set by the child’s SLP.

• Don’t correct the sound in front of the class. Respond to what the child said, not how they said it.
• Reading aloud: offer choices, such as a volunteer turn, reading with a partner, or practising a passage first. Don’t single the child out.
• Give time: wait for answers, and don’t finish the child’s words or sentences.
• Keep any practice the SLP asks for private and short, and praise effort.
• Note what you see: when the lisp is more noticeable, how the child joins in, and any teasing. Share it with parents and the school SLP or SENCO.

Those notes matter. ASHA describes a teacher’s report of a child’s participation as part of assessment, and England’s SEND Code of Practice has the class teacher, working with the SENCO, analyse a pupil’s needs as the first step of the graduated approach.^4,13,14

If there is a concern, use the school’s own route: in the U.S., support through MTSS/RTI or a request for an IEP evaluation; in England, the graduated approach and a conversation with the SENCO.^2,4,13,14

On reading: ASHA notes that poor speech sound production in kindergarten is linked with lower literacy outcomes, especially when there are also language or phonological awareness difficulties. That does not show that an isolated lisp causes reading problems.⁴

How parents and teachers can share practice

Home and school work best from the same plan. ASHA describes SLPs consulting and collaborating with families, caregivers and other professionals, so ask the child’s SLP how practice should be shared.⁴

1. 1Agree one short routine with the SLP: which words, how often, and who listens (a parent at home, a named teaching assistant at school).
2. 2Keep a shared note or log so home and school both know what was practised.
3. 3Keep practice private, short and positive, and praise effort.
4. 4Check back with the SLP before changing the words or the routine.

If you’re a parent deciding whether to raise the S sound with the school or an SLP, our free lisp check is a quick starting point. It listens to a few S and Z words and gives a preliminary screen only; it is not a diagnosis and never names a lisp type.

SpeechStep can sit alongside an SLP’s plan as a home practice tool for S and Z words, so home and school work on the same targets. It is not therapy and does not replace an assessment by a licensed SLP.

Teasing: what the evidence says and when to step in

Children with speech differences may face a higher risk of peer problems. In a U.K. cohort study, children with persistent speech disorder at age 8 were more likely to have peer problems at 10–11, as reported by teachers and parents. Teachers also reported more emotional problems, though the children themselves were no more likely to report depression.¹²

The evidence has limits. The classroom attitude study is from 1991 and measured reactions to videos, the cohort study covered broader persistent speech disorder and left out children whose only errors were common distortions such as a lisp, and neither shows that a child with a lisp will be teased or that teasing causes harm.^11,12

• Step in straight away if comments are repeated, aimed at the child’s speech, or the child starts avoiding speaking, reading aloud or school.
• Follow your school’s anti-bullying policy; we did not find official guidance specific to speech-related teasing.
• Tell parents, and let the SLP know, since peer difficulties are worth discussing in any plan.
• Deal with the behaviour of the children doing the teasing. Don’t ask the child to “fix” their speech to make it stop.

When to involve a speech-language pathologist

An SLP is also the right person to ask about tongue or teeth questions: ASHA lists distorted S and Z, often with an interdental lisp, among the signs of orofacial myofunctional disorders, which affect how the tongue rests and moves and need professional assessment.⁶

Some lisps don’t fade on their own. The idea that tongue-forward lisps resolve more often than lateral or palatal ones is clinical opinion, and the clinician who describes it says she knows of no studies that confirm it.¹⁰

• Find a licensed SLP
• Lisp types and when each is a concern
• Supporting a child who feels self-conscious
• What speech therapy for kids involves

Frequently asked questions

References

17 sources from authoritative bodies. Last reviewed October 2026.

1. 1.Government34 CFR 300.8 – Child with a disability — Federal regulation (IDEA), current version, 2026.
2. 2.ASHAEligibility for School-Based Speech-Language Services — Professional guidance page (undated), 2026.
3. 3.ASHAEligibility and Dismissal Criteria in School Services — Professional FAQ (undated), 2026.
4. 4.ASHASpeech Sound Disorders: Articulation and Phonology — Practice Portal page, 2026.
5. 5.ASHASpoken Language Disorders — Practice Portal page, 2026.
6. 6.ASHAOrofacial Myofunctional Disorders — Practice Portal page, 2026.
7. 7.Peer-reviewedKrueger — Eligibility and Speech Sound Disorders: Assessment of Social Impact — Professional journal article (Perspectives of the ASHA Special Interest Groups), 2019.
8. 8.Center for Parent Information and ResourcesSpeech and Language Impairments — U.S. parent-center fact sheet (undated), 2026.
9. 9.Peer-reviewedCrowe & McLeod — Children’s English Consonant Acquisition in the United States: A Review — Peer-reviewed review (AJSLP), 2020.
10. 10.speech-language-therapy.com (Caroline Bowen)Lisping – When /s/ and /z/ Are Hard to Say — Clinician-authored reference (2011, not peer-reviewed), 2011.
11. 11.Peer-reviewedCrowe Hall — Attitudes of Fourth and Sixth Graders Toward Peers With Mild Articulation Disorders — Peer-reviewed study, 1991.
12. 12.Peer-reviewedWren et al. — Social, Emotional and Behavioural Difficulties Associated with Persistent Speech Disorder in Children: A Prospective Population Study — Peer-reviewed cohort study (JCPP Advances), 2023.
13. 13.GovernmentSpecial Educational Needs and Disability Code of Practice: 0 to 25 Years — Statutory guidance (Department for Education and Department of Health, England), 2015.
14. 14.GovernmentBest Start in Speech, Language and Communication: Guidance to Support Local Commissioners and Service Leads — Government guidance (Public Health England), 2020.
15. 15.GovernmentSLT Referral Criteria – Children’s Team — NHS local referral criteria (undated), 2026.
16. 16.GovernmentReferral forms – Speech and Language Therapy – Essex Children’s Integrated Therapies (NELFT NHS Foundation Trust) — NHS service page (archived copy, March 2026), 2026.
17. 17.GovernmentSpeech and Language Therapy for Children — NHS service page, 2026.