Speech Clarity (Including Lisps)
Psychologists | Speech Language Pathologists | Occupational Therapists | Exercise Physiologists | Therapy Assistants
Psychologists | Speech Language Pathologists | Occupational Therapists | Exercise Physiologists | Therapy Assistants |
What is a speech clarity difficulty?
Speech clarity difficulties (sometimes called speech sound disorders) occur when children have trouble producing certain sounds clearly, making them harder to understand. This might affect one or two sounds, or a wider range, and it can vary in how much it impacts day-to-day communication.
It's completely normal for young children to mispronounce sounds as their speech is developing. But by certain ages, most sounds should be coming in clearly. When they're not, speech therapy can help children build the clear, confident speech they need to be understood at home, at school, and in the community.
Lisps are one of the most common speech clarity concerns families bring to us. A lisp involves difficulty producing the 's' and 'z' sounds clearly, often resulting in those sounds coming out as 'th'. There are different types of lisps, and with the right support, most respond very well to speech therapy.
What does a speech clarity difficulty look like?
- Is difficult to understand (even for familiar adults)
- Leaves sounds off the beginning or end of words
- Substitutes one sound for another (e.g. saying 'tar' for 'car', or 'wed' for 'red')
- Produces sounds in an unusual place in the mouth
- Has a lisp, sounds like 'th' instead of 's' or 'z'
- Seems frustrated when people don't understand them
- Is reluctant to speak in certain situations, especially with unfamiliar people
- Is teased by peers about the way they speak
When should speech sounds be clear?
As a general guide:
By age 3: Most people should understand your child about 75% of the time
By age 4: Speech should be mostly clear to unfamiliar listeners
By age 5–6: Most sounds should be established, including 's', 'l', and blends
By age 7–8: More complex sounds like 'r' and 'th' should be clear
If your child's speech doesn't seem to be following this rough pattern, or if they're showing signs of frustration or reduced confidence, it's worth seeking an assessment.
How can speech therapy help?
- A thorough assessment of which sounds your child is finding difficult and why
- Targeted therapy to help your child learn to produce sounds clearly and consistently
- Techniques that are playful, encouraging, and tailored to your child's age and interests
- For lisps: specific therapy approaches that address the placement of the tongue and airflow
- Home practice activities families can do in everyday routines
- Where relevant, collaboration with other professionals such as dentists or orthodontists
Most speech sound difficulties (including lisps) respond well to targeted therapy. The earlier support begins, the easier it tends to be.
Practising an incorrect sound pattern can sometimes reinforce the error. Speech pathologists are trained to identify what's going wrong and teach children the right motor patterns from the start — making progress much faster than practice alone.
By age 4, the majority of what a child says should be understandable to people who don't know them well. If your 4-year-old is still difficult to understand for strangers, it's worth getting a speech pathology assessment.
"They just need to practise more."
FACT
FACT
Myth
"Only family can understand them, that's normal for their age."
Myth
Some lisps do resolve naturally in the early years, but many don't, particularly when they involve the tongue pushing forward or sideways. By school age, if a lisp is still present, it's unlikely to self-correct and can affect a child's confidence and literacy skills. Therapy is very effective.
FACT
"Lisps are cute, they'll grow out of it."
Myth
Myths and facts about speech clarity
No. Many teenagers successfully work on speech clarity goals, including lisps and other speech sound differences. Speech therapy can support clearer communication while also building confidence and reducing the impact that speech difficulties may have on school, work, friendships, and everyday life. Therapy is tailored to the young person's goals and what is important to them.
My teenager still has a lisp. Is it too late for speech therapy?
Yes, there's a strong connection between speech sound development and phonological awareness, which is a key foundation for reading and spelling. Children with significant speech sound difficulties may benefit from additional literacy support alongside their speech therapy.
How long does therapy for speech clarity usually take?
Can speech sound difficulties affect literacy?
This varies depending on the number of sounds affected, the type of difficulty, the child's age, and how consistently home practice happens. Some children make rapid progress in a few months; others need longer-term support. Your speech pathologist will give you a realistic picture after assessment.
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