What we treat / Lisps
Lisps
“It sounds adorable now, but should we be worried?” A lisp is a difference in how a child produces the /s/ and /z/ sounds. It's one of the most common, and most treatable, speech differences in childhood. Some are a normal part of learning to talk; others won't correct themselves. With the right support, lisps respond well to therapy.
Signs to watch
Clues that your child's lisp deserves a closer look
Age benchmarks from Caroline Bowen, PhD (speech-language-therapy.com) and ASHA. Every child varies; the type of lisp matters more than the age.
“S” and “z” still sound like “th” (“thoup” for “soup”) past about age 4½.
The /s/ sounds “slushy,” wet or spitty, at any age. This suggests a lateral lisp, which doesn't resolve on its own.
You can see the tongue poking between the teeth during everyday talking.
Unfamiliar listeners have trouble understanding your child, or ask them to repeat often.
Your child gets frustrated, avoids certain words, or has been teased about how they talk.
The lisp comes along with persistent thumb-sucking, mouth breathing, or concerns about teeth alignment.
Your child is approaching school age and the lisp isn't fading.
How KidSLP helps
First we find out which lisp it is. Then we teach the tongue a new home.
We identify the type of lisp
A tailored evaluation pins down which of the four types your child has, and whether therapy is needed now or monitoring is the right call. Frontal lisps often fade by about 4½; lateral and palatal lisps don't.
Play-based articulation therapy
We teach the tongue its new “home” with kid-friendly cues, mirrors and games, then practice up the ladder from single sounds to syllables, words, sentences and everyday conversation. Progress is tracked step by step, from “thun” to “sun.”
Coaching, habits and the whole team
Caregiver coaching so you know exactly how (and how much) to practice at home. Gentle, team-based plans for thumb-sucking or tongue-thrust patterns when they're part of the picture. And collaboration with dentists, orthodontists and ENTs when structure or airway plays a role.
Go deeper
Everything else parents want to know
Open a section. Nothing here replaces an evaluation.
A lisp is a type of speech sound (articulation) difference. It happens when the tongue is in the wrong spot, or air flows in the wrong direction, during “s” and “z” sounds. SLPs describe four types:
- Interdental (frontal) lisp: the tongue slips forward between the front teeth, so “sun” sounds like “thun.” This is the most common type.
- Dentalized lisp: the tongue presses against the back of the front teeth, making /s/ sound muffled.
- Lateral lisp: air escapes over the sides of the tongue instead of down the middle, creating a “slushy” or wet-sounding /s/.
- Palatal lisp: the middle of the tongue lifts toward the roof of the mouth, distorting the sound (sometimes closer to an “h” or “y”).
Here's the key distinction: interdental and dentalized lisps can be part of typical speech development up to about age 4½. Lateral and palatal lisps are not part of typical development at any age; they're worth checking whenever you notice them (Caroline Bowen, PhD, speech-language-therapy.com).
Many young children lisp while they're learning to talk. In the early years, a frontal lisp is often nothing to worry about. Speech sound disorders as a group affect about 8–9% of young children (NIDCD), and by age 4 most children can be understood by most people, even if sounds like /s/, /z/ and “th” are still maturing (ASHA).
There's often no single cause. Things that can contribute include tongue-placement habits (like a “tongue thrust” swallowing pattern), dental or jaw alignment, tongue tie, mild hearing loss, frequent mouth breathing, and for some children prolonged thumb-sucking or pacifier use. Many children with lisps have none of these; the tongue simply learned the sound a different way.
Either way, there's no blame here. A lisp is a pattern the tongue learned, and patterns can be changed, whether your child is four or fourteen.
An evaluation by a licensed speech-language pathologist is the first step. At KidSLP, articulation evaluations feel like playtime: we listen, watch and play games while gathering exactly what we need. You stay with your child the whole time, in your home or online.
- A caregiver interview about speech history, habits (thumb-sucking, pacifiers, mouth breathing), and your concerns.
- A hearing screening. Even mild hearing loss can affect how sounds are learned.
- A look at the lips, jaw, tongue and teeth: how they move and how they're built, including checking for tongue tie or dental factors.
- Listening to your child's sounds in single words, sentences, and relaxed conversation.
- Identifying the type of lisp, because the type determines whether to watch and wait or start therapy now.
The SLP then explains what kind of lisp your child has, whether it's developmentally typical for their age, and what next steps look like. When teeth, tongue tie or airway issues are part of the picture, we coordinate with your dentist, orthodontist or ENT.
Timing depends on the type of lisp. A frontal lisp in a 3-year-old is usually just development doing its thing. But a “slushy” lateral or palatal lisp is worth evaluating whenever you notice it, and a frontal lisp that persists past about 4½ shouldn't sit on a “wait and see” list for long. The longer a tongue pattern is practiced, the stronger the habit becomes and the longer it can take to change (Caroline Bowen, PhD, speech-language-therapy.com).
Well-timed support helps children:
- Build clear speech before sound-letter connections matter for reading and spelling
- Speak up with more confidence at school, without fear of being teased
- Change the habit while it's easiest to change
- Address related habits (tongue thrust, thumb-sucking) with a supportive plan
At KidSLP, we focus on fun, child-led play, evidence-based strategies and caregiver coaching, so you can support your child's speech at home and out in the community.
Tips for parents
What you can do at home, starting today
Model, don't mimic
Repeat what your child said with a clear, natural /s/ (“Yeth!” becomes “Yes! It's sunny!”). Never imitate the lisp, even playfully.
Skip the constant corrections
“Say it again” all day builds frustration, not skills. Casual, warm modeling works better. Save real practice for the games your SLP gives you.
Make home practice tiny and fun
Once therapy starts, a few playful minutes a day (sticker charts, silly word hunts) beat long drill sessions every time.
Read books packed with “s”
Snakes, seasides, superheroes. Let your child hear crisp /s/ sounds over and over in stories they love.
Tend to the habits gently
If thumb-sucking, pacifiers or mouth breathing are in the mix, ask us for a kind, pressure-free plan. Punishment approaches backfire.
Set the no-teasing rule
Make sure siblings and relatives know it: no teasing, no imitating. Confidence is what keeps a child talking.
Celebrate what they say
Notice the message, not just how it sounded. A child who feels heard keeps talking, and talking is where the practice happens.
Keep the team in the loop
If your child sees a dentist, orthodontist or ENT, tell us. Teeth, tongue tie and airway can all play a part in a lisp.
Through a child's eyes
Sofia's story
Illustrative story. Sofia is a fictional child, not a KidSLP client.
Meet Sofia, a sunny five-year-old who loves soccer and her cat, Sunny. She has a lot to say, but her “s” comes out as “th,” so “soccer” sounds like “thoccer.” Her family thought it was cute at three. At five, with kindergarten underway, they wanted to know if it would fade on its own.
Morning: getting ready for school
“Where my thocks?” Sofia calls. Mom holds them up with a smile: “Your socks! Here are your socks.” No corrections, no pressure, just a clear, friendly model. Through KidSLP's caregiver coaching, Mom has learned that hearing the sound done right, over and over, matters more than being told it was wrong. Socks, cereal, sunshine, school bus: a dozen easy models before they're out the door.
At school
At snack time, a classmate giggles: “You said thnack!” The teacher steps in kindly: “Sofia's learning her snake sound. Everybody's learning something.” Sofia keeps her chin up. Her words are worth hearing, however they come out. Later, on the playground, she calls the plays for a game of tag, and nobody's counting her s's.
Afternoon: speech therapy with KidSLP
Later, at the kitchen table, Sofia meets her SLP for “snake school.” Teeth together, tongue tucked behind the fence: “ssssss!” They slide toy snakes down a ramp, hunt for hidden “s” pictures, and give Sunny the cat a “sssuper sssnack.” Every hiss earns a sticker. It feels like a game, because it is one, a game that's teaching her tongue a brand-new home. Mom sits in on the cues, so she can use the same words at bedtime.
Evening: at home
At bedtime, Dad reads a story about a seaside adventure and lets Sofia find every “s” picture on the page. “Sun!” she says carefully, teeth together, tongue tucked in. “Ssssun.” Dad grins: “You found the sun AND your snake sound.” Five minutes, one sticker, lights out.
Over time
Little by little, “thun” becomes “sun,” first in games, then in words, then in more and more of her everyday talk. Some weeks the old habit creeps back; the snake school keeps going, and so does the sticker chart. One afternoon at practice, Sofia shouts, “Pass it! I'm so fast!” and the /s/ lands clear. She doesn't even notice. She's too busy playing soccer.
At KidSLP, we help children like Sofia find their voice — because every child deserves to be heard.
Questions parents ask
The questions we hear most about lisps
It depends on the type. Frontal and dentalized lisps are often part of typical development, and many children do outgrow them by about age 4½. Lateral and palatal lisps are different: they aren't part of typical development and generally don't resolve on their own. If you're unsure which type you're hearing, that's exactly what an evaluation is for.
Maybe partly, for some children. Prolonged sucking habits can influence tongue posture and dental alignment, which can contribute to a lisp. But plenty of children with lisps never sucked a thumb, and plenty of thumb-suckers never lisp. Either way, there's no blame here, just a pattern we can work on together.
It varies with your child's age, the type of lisp, how long the pattern has been practiced, and how consistently home practice happens. Lisps generally respond well to articulation therapy, and progress is easy to hear, which makes this one of the most motivating goals for kids and caregivers alike.
Lots. See the tips above: model a clear /s/ instead of correcting, keep practice short and playful once therapy starts, read “s”-heavy books, handle habits like thumb-sucking gently, and make sure nobody at home teases or imitates.
Trusted resources
Where our numbers come from
Reputable sources parents can read themselves.
Every voice grows differently. Let's talk about yours.
Fifteen minutes with a licensed speech-language pathologist. No forms about your child's health, no commitment — just a conversation about what you're noticing.
This page is educational and does not replace an evaluation by a licensed speech-language pathologist. Statistics cited from NIDCD and ASHA; age benchmarks from Caroline Bowen, PhD (speech-language-therapy.com).