Saying “s” in place of “sh” is a phonological process called palatal fronting. It’s one of the most commonly discussed patterns in childhood speech development, where sounds normally made further back in the mouth get moved forward. A child using palatal fronting would say “sip” instead of “ship” or “sue” instead of “shoe.”
What Palatal Fronting Sounds Like
Palatal fronting specifically targets the “sh” and “zh” sounds, replacing them with “s” and “z.” The word “ship” becomes “sip,” “shoe” becomes “sue,” and “measure” sounds more like “mezza.” The pattern is consistent: every sound that should be produced at the palate gets shifted forward toward the teeth ridge, where “s” and “z” are made.
This happens because the two sounds are close cousins. Both “s” and “sh” are fricatives, meaning they’re produced by pushing air through a narrow gap between the tongue and the roof of the mouth. The difference comes down to exactly where that gap forms and how the tongue is shaped.
Why “S” and “Sh” Feel So Similar
For “s,” the blade of the tongue rises toward the teeth ridge (the bumpy area just behind your upper front teeth), creating a tight, narrow groove down the center of the tongue. Air hisses through that small channel, producing a sharp, high-pitched sound.
For “sh,” the contact point moves slightly further back, toward the rear edge of the teeth ridge, and the front of the tongue lifts toward the soft palate. The groove the air passes through is wider and shallower than for “s,” which gives “sh” its softer, broader quality. The lip rounding that naturally accompanies “sh” also contributes to its distinct sound.
Because the difference between these two positions is a matter of millimeters, it’s not surprising that young children simplify by defaulting to the slightly easier, more forward placement.
How Palatal Fronting Differs From Velar Fronting
Fronting is actually an umbrella term covering two related but distinct patterns. Palatal fronting replaces palatal sounds (“sh,” “zh”) with sounds made at the teeth ridge (“s,” “z”). Velar fronting replaces sounds made at the back of the mouth (“k,” “g”) with sounds made at the front (“t,” “d”), so “car” becomes “tar” and “go” becomes “do.”
Research from ASHA (the American Speech-Language-Hearing Association) found that velar fronting is significantly more common than palatal fronting. In a study of over 1,000 preschoolers, 67 children were identified as using fronting. All 67 fronted velars, but only 44 also fronted palatals. No child in the study fronted palatals without also fronting velars. This suggests palatal fronting tends to co-occur with velar fronting rather than appearing on its own, and it may resolve slightly differently during development.
When Children Typically Outgrow It
Palatal fronting falls under the broader “fronting” process, which is expected to resolve by around age 3.5 in typical development. Before that age, saying “s” for “sh” is considered a normal part of learning to speak. Children are still figuring out the fine motor control needed to position their tongue precisely, and fronting is one of several shortcuts they use while their speech motor system matures.
If a child continues to front palatal sounds well past age 3.5, especially if the pattern is consistent across many words and contexts, it may point to a phonological delay worth evaluating. A speech-language pathologist can assess whether the pattern is isolated or part of a broader set of phonological processes that haven’t resolved on schedule.
Palatal Fronting in Adults
While palatal fronting is primarily discussed as a childhood speech pattern, some adults also substitute “s” for “sh.” In adults, this can stem from an unresolved childhood pattern, a dialect feature, or a speech sound disorder. The distinction matters: if someone has always spoken this way and it’s consistent with their linguistic community, it’s not necessarily a disorder. If it developed after a neurological event or causes communication difficulties, the context is different.
For anyone learning about this term because they’ve noticed the pattern in a child’s speech, the key benchmark is that 3.5-year mark. Before that age, palatal fronting is developmentally expected. After it, persistence is worth a closer look.