Stopping is a common speech pattern in young children where they replace sounds that use continuous airflow (like /s/, /f/, or /sh/) with shorter, abrupt sounds (like /t/, /p/, or /d/). So a child might say “tun” instead of “sun” or “pish” instead of “fish.” It’s one of the most frequently identified phonological processes in early childhood, and it’s completely normal up to a certain age. After that point, it may signal a need for speech therapy.
How Stopping Works
When you say a sound like /s/ or /f/, air flows continuously through your mouth. These are called fricatives. Sounds like /ch/ and /j/ combine that airflow with a brief burst and are called affricates. Stop sounds, on the other hand, are quick bursts where the tongue or lips briefly block airflow entirely: /p/, /b/, /t/, /d/, /k/, and /g/.
Children who use stopping are essentially swapping the long, flowing sounds for short, punchy ones. They’re simplifying the way they produce speech because the continuous airflow sounds are harder to coordinate. Here are some typical examples:
- “sun” becomes “tun” (/s/ replaced by /t/)
- “zoo” becomes “doo” (/z/ replaced by /d/)
- “shoe” becomes “too” (/sh/ replaced by /t/)
- “fish” becomes “pish” (/f/ replaced by /p/)
- “chair” becomes “tear” (/ch/ replaced by /t/)
- “jam” becomes “dam” (/j/ replaced by /d/)
This isn’t random. Children who use stopping do it in a predictable, rule-based pattern across entire groups of sounds rather than making isolated mistakes on one or two words. That’s what makes it a phonological process rather than a simple articulation error.
When Stopping Is Normal and When It’s Not
All toddlers use phonological processes like stopping as they learn to talk. The key question is whether they’ve outgrown it by the expected age. According to the American Speech-Language-Hearing Association, stopping of /f/ and /s/ should disappear by age 3. Stopping of /v/ and /z/ should disappear by age 3.5 to 4. If a child is still consistently replacing these sounds after those milestones, it’s worth having their speech evaluated.
Some of the sounds affected by stopping are naturally acquired later than others. A large cross-linguistic review of consonant acquisition found that across studies of English-speaking children, plosives and nasals are acquired earliest, while fricatives and affricates come later. Specifically, /f/ is typically mastered between ages 2 and 3, /s/, /z/, /v/, /sh/, /ch/, and the /j/ sound between ages 4 and 5, and sounds like “th” as late as 5 to 6. So a 3-year-old who stops /s/ is at the tail end of normal, while a 5-year-old doing the same thing likely needs intervention.
Stopping also has a bigger impact on how well others can understand a child compared to some other phonological patterns. Research shows that stopping and final consonant deletion affect intelligibility more than many other error patterns, which is why speech-language pathologists pay close attention to it.
How Stopping Is Identified
A speech-language pathologist evaluates stopping by looking at patterns across a child’s speech rather than focusing on individual sounds in isolation. The clinician listens for whether the child consistently replaces fricatives and affricates with stops, and how frequently they do it. A general guideline used in clinical practice is that a phonological process needs to appear in at least 40% of opportunities to be considered significant.
It can sometimes be tricky to separate phonological patterns like stopping from other types of speech sound issues. A child might show both articulation errors (difficulty physically producing a sound) and phonological errors (rule-based substitution patterns) at the same time. The pathologist may also need to rule out childhood apraxia of speech, which involves difficulty planning and coordinating the movements for speech rather than using predictable substitution patterns.
Therapy Approaches for Stopping
Several therapy methods target stopping effectively, and a speech-language pathologist will choose based on the child’s specific error patterns and severity.
Minimal Pairs
This is one of the most widely used techniques. The therapist presents pairs of words that differ by only one sound, so the child can hear and see how changing the sound changes the meaning. Common pairs for stopping include “tea” vs. “sea,” “chop” vs. “top,” “fan” vs. “pan,” and “jeep” vs. “deep.” When the child says “toup” for “soup,” the therapist might respond with gentle confusion: “Oh, you want a cup? Or do you mean ssssoup?” This helps the child realize their substitution creates a different word entirely.
The Cycles Approach
Developed for children with highly unintelligible speech, the cycles approach works differently from traditional drill-based therapy. Instead of practicing one sound until it’s mastered before moving on, the therapist cycles through multiple sound patterns over set time periods. Each sound or pattern is typically targeted for one hour per week (split into shorter sessions) over a cycle lasting anywhere from five to 16 hours total. Then the cycle repeats as needed.
This approach is built on the principle that children don’t naturally learn one sound perfectly before acquiring the next. There’s natural experimentation and overlap. One notable finding from clinicians using this approach is that for children who stop fricatives and also simplify consonant clusters, targeting /s/ clusters (like “sp” or “st”) before targeting /s/ by itself actually produces bigger gains in intelligibility. That’s counterintuitive, but it seems to help the child build a stronger framework for using continuous airflow sounds.
Auditory Bombardment
This technique floods the child with examples of the target sound in natural speech. The therapist or parent reads stories or describes activities while stretching out the target sound: “I see a sssssnake in the ssssand.” The child doesn’t have to produce the sound during this activity. The goal is to sharpen their ear for what the correct sound is before they’re asked to make it themselves.
What Parents Can Do at Home
Home practice significantly reinforces what happens in therapy sessions. The good news is that many effective activities are simple and fit naturally into daily routines.
One of the most helpful strategies is using tactile cues to teach the difference between “long” sounds and “short” sounds. Place a cotton ball on a table and have your child try to move it by making an /f/ or /s/ sound. If they use a stop sound like /p/ instead, the ball will only hop. A real fricative creates a steady stream of air that pushes it smoothly across the surface. You can also draw a long line in the air while saying “ssssss” and then make a quick dot while saying “t!” to visually show the contrast.
Give the sounds kid-friendly names. Fricatives can be “snake sounds” or “long windy sounds.” Stops can be “popping sounds” or “short sounds.” These labels help children understand what they’re aiming for without needing to grasp the mechanics of airflow.
Daily routines offer natural practice opportunities. At mealtimes, stretch out target sounds: “Let’s blow on the sssssoup.” During bath time, play with “fffff-oam” or a toy “sssship.” On walks, point out things with target sounds: “I see a ssssign.” The repetition in everyday contexts is what helps new sound patterns stick.
When your child makes an error, avoid direct correction like “No, say sun.” Instead, recast naturally: “Yes, the sssun is so bright today!” This keeps the interaction positive while modeling the correct sound clearly. Children are more likely to absorb the correction when it’s woven into the conversation rather than delivered as a correction.
How Long Therapy Takes
There’s no single answer because it depends on how many sounds are affected, whether the child has other phonological patterns beyond stopping, and how consistently they practice outside sessions. Children with stopping as their primary pattern and good stimulability (meaning they can imitate the target sound when prompted) tend to progress faster than children with multiple overlapping error patterns.
The cycles approach, for reference, typically runs through multiple cycles of five to 16 hours each before patterns begin carrying over into everyday conversation. Many children with phonological delays show noticeable improvement within a few months of consistent therapy, though full resolution of all affected sounds can take longer, particularly for later-developing sounds like “th” or “sh.” Progress usually accelerates once the child grasps the general concept that air needs to keep flowing for certain sounds, since that insight tends to transfer across multiple fricatives rather than needing to be relearned sound by sound.