Is My Child’s Lisp Something to Worry About?
Written and reviewed by Nita Anavim, M.S., CCC-SLP. Last reviewed July 27, 2026.
He says “thun” for “sun” and “yeth” for “yes” and honestly it is adorable, right up until someone at a birthday party asks whether you have had it looked at. Then you start wondering whether your child’s lisp is a phase everyone outgrows or something that needs attention.
Here is the short answer: it depends on which lisp it is and how old your child is. A frontal lisp, where the tongue pushes forward between the teeth, is common in preschoolers and often resolves on its own. A lateral lisp, where air escapes over the sides of the tongue and sounds slushy, rarely resolves without help at any age.
What kind of lisp does my child have?
A lisp is one of two kinds: a frontal lisp, where s and z come out like th, or a lateral lisp, which sounds wet or slushy. Listen for the quality of the sound rather than watching the tongue. A frontal lisp sounds like a soft “th” replacing “s” and “z,” so “soup” becomes “thoup.” It is the classic toddler lisp, it sounds clean, and most people find it charming. A lateral lisp sounds wet or slushy, as though the word has too much air in it, and it does not resemble any sound in English. It usually strikes listeners as unusual rather than cute, which is a rough but useful test.
At what age should a lisp go away?
A lisp is expected to fade on its own by around age 4 to 5, because the s and z sounds are among the later ones to settle. ASHA notes that most children say almost all speech sounds correctly by age 4, but that at 4 a child may still make mistakes on s, sh, ch, j, ng, th, z, l, and r. So a lisp at three or four is squarely within the typical range and often fades without anyone doing anything. Most speech-language pathologists start paying closer attention somewhere around age five, and by seven a persisting frontal lisp is unlikely to resolve on its own. A lateral lisp is different: because it is not a developmental stage that children pass through, waiting for it to resolve usually means waiting a long time.
Why does my child lisp?
Most often it is simply where the tongue is landing. The “s” sound needs a narrow stream of air down the center of the tongue with the tip tucked behind the teeth, which is a precise piece of coordination, and children arrive at it at different times. Other contributors include a gap between the front teeth while the adult teeth come in, chronic congestion or mouth breathing that changes resting tongue position, and habit, since a pattern that has been practiced thousands of times becomes automatic.
Should I correct my child’s lisp at home?
Correcting a lisp at home is best done gently and sparingly, and never by asking a young child to repeat a word until it comes out right. What helps is modeling: if she says “thock,” you say “yes, your sock,” landing on the sound clearly and moving on. What backfires is repeated correction, because it makes speaking feel like a test and can leave a child self-conscious about talking at all.
Be especially careful about home exercises you find online for a lateral lisp. The tongue positions involved are hard to explain in words and easy to practice wrongly, and a wrongly practiced sound becomes another habit to undo later.
When should we see a speech therapist about a lisp?
The time to see a speech therapist about a lisp is sooner than most families do, in three situations. If the lisp sounds slushy or wet rather than like a clean “th,” get it looked at whatever the age. If a frontal lisp is still there around six, it is worth an evaluation rather than another year of waiting. And if your child has become aware of it, is being teased, or is avoiding words with “s” in them, the social cost has already started, and that matters regardless of what the sound is doing.
How is a lisp treated?
A lisp is treated straightforwardly, and usually with a good outcome. Therapy works out where the tongue and airflow currently go, teaches a new position for the sound in isolation, then builds it up through syllables, words, sentences, and eventually ordinary conversation, which is the step that takes the longest because the old pattern is automatic. Progress depends on practice between sessions, which is why parent coaching is part of it.
Sound work fits well into short, frequent practice at home, and it also transfers well over video, so families often use telehealth speech therapy for articulation goals. Older children in particular tend to like it, since a screen feels less like being singled out.
A lisp is one specific sound pattern, so it helps to see it against which speech sounds should be clear at which age. If strangers still struggle to follow your child, or you are unsure whether to correct your toddler in the moment, those are the questions worth reading next, especially when you are the only one who understands your toddler.
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As of October 2026, there is no waiting list here for in-home or telehealth therapy. An evaluation can begin within 3 business days of your free call, and a first session as soon as 5 days after you call, for in-home and telehealth families. Some private in-clinic sessions are available on request.
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Common question: Is it normal for my child to leave sounds off or swap them?
Nita Anavim is a licensed speech-language pathologist (M.S., CCC-SLP) and co-founder of Therapy Clubhouse who helps children from birth to 18 build communication, language, and feeding skills through warm, play-based, family-included therapy.
This article is for general educational purposes only and is not medical advice or a substitute for an individualized evaluation. Every child is different. If you have concerns about your child’s speech, language, or development, please consult a qualified professional.
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