Conquering the ‘slushy’ /S/: Your guide to treating lateral lisps

ByLondon Speech and Feeding
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Conquering the ‘slushy’ /S/: Your guide to treating lateral lisps

As a speech therapist, few things are as rewarding as helping a child find their clear, confident voice. Among the various speech sound disorders, the ‘lateral lisp’ – often described as a ‘slushy’ or ‘wet’ /S/ sound – presents a unique challenge. While it can be tricky to treat, I’m thrilled to share that I’ve had significant success in helping children overcome this particular hurdle.

What is a lateral lisp?

Most people are familiar with a frontal lisp, where the tongue protrudes between the front teeth, resulting in a /TH/ sound for an /S/ (e.g., ‘thun’ for ‘sun’). A lateral lisp, however, is different. Instead of the air escaping over the front of the tongue, it escapes over the sides, often giving the /S/ and /Z/ sounds a distinct, muffled, or ‘slushy’ quality. This happens because the tongue is not forming the correct central groove, allowing air to spill out laterally.

The science behind a perfect /S/ vs. a slushy one

To understand how to fix a lateral lisp, it’s helpful to understand how a ‘perfect’ /S/ sound is made. Imagine a narrow, focused stream of air. For a clear /S/ sound, your tongue forms a shallow groove down its centre, directing a precise, thin stream of air right down the middle, over the tip of your tongue, and out through a tiny opening between your tongue and the roof of your mouth, just behind your front teeth. This focused airflow creates that crisp, sharp /SSSS/ sound we recognise.

Now, picture what happens with a lateral lisp. Instead of that neat, central channel, the tongue is often flatter or positioned in a way that allows the air to escape over one or both sides. Think of it like a river overflowing its banks – the air, instead of flowing in a controlled stream, spills out sideways, creating that characteristic ‘slushy’ sound. This lateral airflow is what we need to retrain.

Why is it tricky to treat?

Treating a lateral lisp can be challenging for a few reasons:

  • Habitual muscle memory: The way the tongue moves and positions itself for a lateral lisp is deeply ingrained. It’s a motor habit that needs to be unlearned and replaced with a new, more precise movement.
  • Subtle differences: The difference between a lateral lisp and a correct /S/ sound can be quite subtle to perceive, both for the child and sometimes even for parents. This makes it harder for the child to self-monitor and correct.
  • Oral motor control: It requires fine motor control of the tongue muscles to create and maintain that central groove for airflow.

My success with children aged six years and over

I’ve found great success in treating lateral lisps, particularly with children aged six years and older. Why this age group? By this age, children typically have:

  • Increased awareness: They are more aware of their speech and often more motivated to make changes. They can better perceive the difference between their ‘slushy’ /S/ and a clear one.
  • Improved cognitive skills: They can understand and follow more complex instructions and strategies.
  • Better self-monitoring: Their ability to listen to themselves and correct their own speech improves significantly.
  • Enhanced oral motor control: Their fine motor skills, including those of the tongue, are more developed, allowing for greater precision.

My approach focuses on a combination of auditory discrimination, tactile cues, and targeted myofunctional exercises to help children ‘feel’ the correct airflow and tongue placement. We use a variety of engaging activities to make the process fun and effective.

It is crucial to understand tongue functioning and focusing on correcting improper oral resting posture and muscle function, which are often significant contributors to a lateral lisp. For example, if the tongue rests low and wide in the mouth consistently, or if there’s a tongue thrust during swallowing, these habits can prevent the tongue from achieving the precise, midline placement necessary for a clear /S/ or /Z/ sound. Through targeted exercises I aim to re-educate the oral and facial muscles, promoting correct tongue posture at rest, during swallowing, and, ultimately, during speech production. By strengthening the muscles responsible for tongue lifting and encouraging a more appropriate swallowing pattern we can establish the correct oral motor skills needed to overcome a lateral lisp and achieve clearer articulation.

The recipe for success: Little and often

The single most crucial ingredient for success in treating a lateral lisp is daily home practice of all the strategies given. This isn’t about long, arduous sessions; it’s about consistency. Think of it like building a muscle: short, frequent workouts yield better results than sporadic, intense ones.

My recommended formula is ‘little and often’. This means:

  • Short, focused sessions: Aim for 5-10 minutes of practice, 2-3 times a day. This prevents fatigue and keeps the child engaged.
  • Integrate into daily routines: Practise while waiting for dinner, during a car ride, or before bedtime. Make it a natural part of their day.
  • Positive reinforcement: Celebrate every small success! Encouragement goes a long way in building confidence and motivation.
  • Parental involvement: Parents play a vital role in providing consistent cues and encouragement at home. I equip families with clear, easy-to-follow strategies.

Overcoming a lateral lisp requires dedication, but with the right guidance and consistent practice, a clear, confident /S/ sound is achievable. If your child is struggling with a ‘slushy’ /S/, please don’t hesitate to reach out. Together, we can achieve success!

Sonja McGeachie

Highly Specialist Speech and Language Therapist

Owner of The London Speech and Feeding Practice.

Health Professions Council registered
Royal College of Speech & Language Therapists Member
Member of ASLTIP

Find a speech and language therapist for your child in London. Are you concerned about your child’s speech, feeding or communication skills and don’t know where to turn? Please contact me and we can discuss how I can help you or visit my services page.

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    As speech and Language therapists (SLTs), we know that where your tongue goes, so goes your sound. This blog post will explore why tongue placement is so vital for speech correction and how we use tools and techniques to help our clients find their ‘sweet spot’ for sound production.

    Let me show you here a little video clip where I am using my dentist’s mouth/teeth model to help my clients navigate their tongue movements.

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    The trouble with our tongue movements is that most of us never think about how the tongue has to move and what it does to: swallow, chew, drink, suck and speak. Most parents when asked to think about their own tongue placement for say the /S/ sound are completely lost as to what their tongue is doing. Yet, of course, they produce a perfect /S/ and perfect speech in general. The same goes for swallowing. When did you last think about what happens in your mouth when you swallow? I bet you have not thought about it. We ‘just do it’, right?

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    Correct tongue placement is essential for clear speech. By using visual aids, interactive techniques, and a bit of creativity, we can help our clients master their speech sounds and communicate with confidence.

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    Meeting our children on their home turf: if that’s dinosaurs, let’s be creative with dinosaurs!

    If imaginative play isn’t the engine driving language, forcing it in the therapy room can quickly turn into an exercise in compliance rather than connection. Instead of trying to pull a child out of their world and into a neurotypical play model, we can meet them exactly where they are!

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    • Validate any scripts or echolalia and find out the EMOTION underlying it: If your child uses a quote from a favourite cartoon clip, let’s try and figure out in what context this phrase was said in the movie; what is the emotion in the movie when the character says this line? Is it upset? Is it joyful? Is it big surprise or a shock? Don’t dismiss it as meaningless. Acknowledge the emotion behind the script ‘You feel worried right now.’ This way we are showing our child that their unique way of communicating is heard and valued.

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    Health Professions Council registered
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    Hard munchables: Chewing through the weaning journey

    ByLondon Speech and Feeding

    As a Speech and Language Therapist with a specialism in paediatric feeding, I’m constantly looking for ways to support families in developing their little ones’ oral motor skills and fostering a positive relationship with food. While Baby-Led Weaning (BLW) has revolutionised how many families introduce solids, (see my previous blog in July 25) a concept that often sparks discussion and curiosity is the use of ‘hard munchables.’

    Image by Freepik

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    The term ‘hard munchables’ refers to specific types of firm non-digestible food items that are offered to babies for oral exploration and skill development, not for nutrition. These are typically foods that babies cannot bite off or swallow in large pieces due to their texture, but which provide resistance for chewing practice.

    The phrase was coined by Marsha Dunn Klein, M.Ed., OTR/L, Occupational Therapist and feeding therapist. Well known for her work in paediatric feeding she introduced and advocated for the concept of hard munchables as part of a therapeutic feeding approach, particularly for infants learning to manage textures and develop crucial oral motor skills.

    Common examples of hard munchables include:

    • Large, raw carrot sticks: Too hard to bite through, but great for gnawing.
    • Celery sticks: Like carrots, offering firm resistance.
    • Large, raw apple slices (peeled chunks): A firm, slightly sweet option.
    • A firm, uncut pear core: With the seeds removed.
    • Dried mango cheeks (hard, unsweetened varieties): These offer a fibrous texture.
    • A large, fully cooked but firm piece of meat (like a steak bone with some meat attached): The meat provides flavour and a bit of shreddable texture, while the bone is for gnawing.
    • Hard crusts of bread or breadsticks (very firm, without soft inner crumb): These can soften slightly with saliva but offer significant resistance.
    Image by Freepik

    It’s crucial to emphasise that hard munchables are not for consumption or nutrition. They are tools for oral motor development and should always be offered under strict, active supervision.

    How do hard munchables fit into weaning?

    While weaning (traditional or Baby-Led Weaning) introduces solid foods that a baby can eventually bite and swallow, hard munchables are complementary to the weaning phase. They enhance that phase by helping a child to develop hand dexterity, hand to mouth movement, and oral development.

    It’s important to differentiate: Weaning provides the digestible food for eating, while hard munchables provide the tool for skill practice. They are not substitutes for each other but can be used together under careful guidance.

    Pros and cons from a speech therapy perspective

    As an SLT, I see both the potential benefits and the necessary precautions when incorporating hard munchables.

    Pros:

    • Enhanced oral motor development: Hard munchables provide excellent resistance training for the jaw, helping to develop the strength, endurance, and coordination needed for efficient chewing. This is foundational for moving beyond purées and very soft textures.
    • Promotes lateralisation of the tongue: The act of moving the hard item from side to side in the mouth encourages the tongue to move independently of the jaw, a crucial skill for managing food and for speech sound production.
    • Preparation for more complex textures: By strengthening the oral musculature and refining chewing patterns, hard munchables can help babies transition more smoothly to lumpy and mixed textures.
    • Sensory exploration: They offer rich sensory input (tactile, proprioceptive) that can be beneficial for oral mapping and awareness, especially for babies who might be orally sensitive.

    Cons:

    • Choking risk: While the intention is for the baby not to bite off pieces, there is always a risk. Small pieces can break off, or a baby might accidentally bite off a larger chunk than he or she can manage. Active, vigilant supervision is non-negotiable.
    • Not a replacement for digestible solids: It’s vital to remember that hard munchables are for practice, not nutrition. They should complement, not replace, the introduction of varied, digestible solid foods.
    • Not suitable for all babies: Babies with certain developmental delays, oral motor deficits, or medical conditions might not be appropriate candidates for hard munchables without highly specialised guidance. For instance, babies with an exaggerated gag reflex might find them overwhelming.

    Key Considerations for Parents

    Here are my top recommendations:

    1. Consult with a professional: Always discuss this with your Paediatric Feeding SLT first before you introduce hard munchables. We can assess your baby’s individual readiness and guide you on safe practices.
    2. Strict supervision: Never leave your baby unsupervised with a hard munchable, even for a second. Your full attention is required.
    3. Appropriate size: Ensure the item is large enough that the baby cannot fit the whole thing in their mouth. It should extend well beyond their fist.
    4. No biting off: The goal is gnawing and scraping, not biting off pieces. If your baby is consistently breaking off chunks, stop using them.
    5. Focus on skill, not consumption: Reiterate to yourself that this is for practice, not for eating.

    In conclusion, hard munchables, when used appropriately and under guidance, can be a very valuable tool to support oral motor development during the weaning journey. However, always be safe and consult with a specialist to ensure your little one develops his or her feeding skills effectively and joyfully.

    Sonja McGeachie

    Highly Specialist Speech and Language Therapist

    Owner of The London Speech and Feeding Practice.

    Health Professions Council registered
    Royal College of Speech & Language Therapists Member
    Member of ASLTIP

    Find a speech and language therapist for your child in London. Are you concerned about your child’s speech, feeding or communication skills and don’t know where to turn? Please contact me and we can discuss how I can help you or visit my services page.

    References:

    Rapley, G., & Murkett, T. (2008). Baby-Led Weaning: The Essential Guide to Introducing Solid Foods. Vermilion.

    Morris, S. E., & Klein, M. D. (2000). Pre-feeding skills: A comprehensive resource for feeding development. Pro-Ed.

    1

  • A day in my speech clinic: Mastering the /SP/ cluster

    ByLondon Speech and Feeding

    I very often work on /S/ Blends (/SP/ /ST/ /SM/ /SK/ /SN/ and /SL/). When we work on these sound blends (like SPider, STop, or SMile), we are using a clever speech therapy ruse! Because these blends are complex, teaching a child how to master them naturally helps them clear up simpler single sounds (like just /S/ or just /P/) at the same time. Plus, because S-blend words are so common in everyday language think spoon, spy, spot, and spin, practising them gives your child an immediate confidence boost when they are understood much more easily.

    Good news: high-repetition motor practice doesn’t have to be a chore. In fact, the more sensory input we can provide, the faster those new neural pathways are built. Recently, I recorded a series of seven short clips to demonstrate how we can weave intense speech practice into the fabric of play.

    Here is a look at a typical day in the clinic focusing on /SP/ blends.

    1. The sensory sandbox:

    We started our session at the sensory table. Sensory bins can often work well because they provide tactile feedback that grounds the child’s focus (of course they are usually messy, so one needs to have the physical space and energy for it to be fair!).

    • The Activity: I pointed to our ‘I Spy’ board before we dove into the sand. Using a toy spade we dug for hidden objects and named them each time we found one.
    • Every time we scooped, we practised Spade. Every discovery was a spider, a spoon or a spotty animal. By pairing the physical effort of digging with the speech sound, we help the brain synchronise motor planning and vocal execution.

    2. Bingo dabbers rock!

    Next, we moved to making ink marks on paper.

    • The Activity: I demonstrated making spots with coloured bingo dabbers.
    • We treated each ink spot as a visual anchor. Stamp –Spot Stamp –Spot. This creates a rhythmic pacing that prevents the child from rushing. It’s a wonderful way to get 50+ repetitions in under five minutes without the child even realising they are ‘working’.

    3. Drawing spiders

    Building on the previous activity, we took those spots and turned them into something more complex.

    • The Activity: I drew spiders out of the spots we had just made.
    • Drawing the legs provided a perfect opportunity for ‘stretch’ sounds. As we drew a long leg, we practise a long, hissy ‘Sssssssss’, snapping into the /P/ as the pen hits the spot.

    4. Wind-up spinners

    High-energy toys are excellent for eliciting ‘power’ sounds.

    • The Activity: I brought out two mechanical wind-up spinners.
    • Method: The child says Spin or Spinner to get me to wind them up. The anticipation of the toy moving acts as a natural reinforcer.

    5. The Incy Wincy spider game

    • The Activity: I spun a game spinner to determine how many steps our toy spiders would take up the spout.
    • This activity is a triple threat. We practised ‘Spin’, ‘Spider’, and ‘Spout’ all in one go. The visual of the spider moving up the spout also helps with the concept of UP and DOWN of course.

    6. Searching for Spot

    Books are a great tool for generalisation, taking a sound from a single word and moving it into phrases and sentences.

    • The Activity: We went through a ‘Spot the Dog’ book.
    • Instead of just reading, we used the ‘I Spy’ strategy. ‘I spy Spot! He has a big spot on his back!’ This encourages the child to use the target word in a functional, communicative way rather than just repeating it after me.

    7. Finally, sponging off some sand

    We ended the session with some ‘heavy work’ and cleaning.

    • The Activity: We took a soft toy that had gotten a bit ‘dusty’ in the sandbox and used a sponge to clean it down.
    • The action of squeezing the sponge provides proprioceptive input (pressure), which can be very calming and help a child focus on their articulatory placement for those final repetitions of the day.
    A day in my speech clinic: Mastering the /SP/ cluster

    Speech therapy works on motor learning. Just like learning to ride a bike or play the piano, the brain needs thousands of correct repetitions to make a movement automatic. By using /SP/ words in these seven distinct, sensory-rich ways, we:

    1. Reduce frustration: The focus is on the play, not the correction.
    2. Increase engagement: A child who is having fun will stay in the learning zone longer.
    3. Provide context: The child learns that saying /SP/ correctly helps them get the spade, spin the spinner, and find the spider.

    Next time I will show you some more activities for /ST/ and /SM/ words. If you have any super ideas for /S/ cluster words please leave me your suggestions in the comments on instagram, I would appreciate it thank you! 😊

    If you are concerned about your child’s speech, please do not hesitate to get in touch. I would love to help you find some answers.

    Sonja McGeachie

    Highly Specialist Speech and Language Therapist

    Owner of The London Speech and Feeding Practice.

    Health Professions Council registered
    Royal College of Speech & Language Therapists Member
    Member of ASLTIP

    Find a speech and language therapist for your child in London. Are you concerned about your child’s speech, feeding or communication skills and don’t know where to turn? Please contact me and we can discuss how I can help you or visit my services page.

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