How to Teach the Z Sound: A Parent’s Guide
The Z sound uses the exact same mouth position as S — tongue tip just behind the front teeth, teeth almost together, air down the middle — but with the voice turned on, so the throat buzzes. Because S and Z are a pair, Z tends to develop around the same time (about age 4 to 5) and shares the same errors, including lisps.
How the Z sound is made
Z is the voiced twin of S. The mouth does exactly what it does for S — the tongue tip points just behind the upper front teeth (or low behind the bottom teeth), the teeth come almost together, and a thin stream of air runs down the middle of the tongue. The one difference is that the voice is turned on, so the throat buzzes.1
Feel the buzz
Have your child rest a hand on their throat. A long “sssss” stays quiet; a long “zzzzz” makes the throat hum. Same tongue, voice switched on.
Why S and Z go together
S and Z are a matched pair — same placement, differing only by voice. That means they usually develop around the same time and share the same error patterns. If you’re working on one, you’re most of the way to the other.1
| Sound | Voice? | Example words |
|---|---|---|
| S | Air only, no buzz | sun, bus, snake, mouse |
| Z | Voice on, throat buzzes | zoo, buzz, zebra, nose |
S and Z: the same mouth, one difference.
Because they’re a pair, a lisp or error on S almost always shows up on Z too — and therapy typically targets them together.1
When children master the Z sound
As a sibilant like S, Z is typically produced clearly by about age 4 to 5, sometimes a little later. Z appears less often than S in early vocabulary, so some children simply get less practice with it at first — which can make it look slightly “behind” S even when development is normal.10,3
Common Z error patterns
- Z → S (devoicing): the mouth is right but the voice is off, so “zoo” becomes “soo.” Very common, because S and Z differ only by voice.
- Frontal lisp on Z: the tongue slips between the teeth, so Z sounds like a voiced “th” (“that”-style buzz replacing Z).
- Lateral lisp on Z: air spills over the sides of the tongue, giving a wet, “slushy” Z — the same slushy quality you’d hear on S.
These mirror the S errors, because S and Z share a mouth position. A lateral (slushy) lisp on Z, like on S, is not part of typical development at any age and is worth having assessed. A simple devoicing error is usually the easiest to fix — it’s just about turning the voice on.1,2,5
How to teach the Z sound: step by step
If your child can already make S, Z is a short hop away — you’re adding voice, not changing the mouth. Work at a mirror in short, playful bursts.
- 1Start from a good S. Make a long, thin “ssss” with the teeth close and the tongue behind them.
- 2Turn the voice on. Keep everything the same and “add your motor” — “sssss” becomes “zzzzz.”
- 3Feel the buzz. A hand on the throat should hum on Z but not on S — that contrast is the whole lesson.
- 4Say it in words. Start with easy Z words, then short phrases, then everyday talk.
- 5Practice S and Z together. Since they’re a pair, alternating them (“sip–zip,” “bus–buzz”) reinforces both.
Skip the tongue push-ups
Non-speech mouth exercises don’t teach Z. Practicing the real sound in real words — with the throat buzz — is the fastest path.
Free Z Sound Practice
Practice the Z sound and get instant, private AI feedback.
Z practice words by position
Practice Z at the beginning, middle, and end of words. Note that Z is often spelled with the letter “s” (as in “nose” or “bugs”) — those still count as Z practice.
| Position | Words |
|---|---|
| Beginning | zoo, zebra, zip, zero, zigzag |
| Middle | lizard, dizzy, puzzle, present, music |
| End (often spelled “s”) | buzz, nose, bugs, shoes, cheese |
| Short phrases | zip the bag, buzzing bees, a busy zoo |
Z practice words by position.
When Z is steady, alternate it with S in minimal pairs — “sip vs. zip,” “bus vs. buzz” — so your child hears and feels that the only difference is the voice.1
When to see a speech-language pathologist
When to get an evaluation
Consider an evaluation if Z (and S) errors persist past about age 4½ to 5, if you hear a wet “slushy” lateral lisp at any age, if your child is hard to understand, or if home practice isn’t helping.
A certified speech-language pathologist can check how S and Z are being produced and target them together — in person or by teletherapy, which is effective for many children.8,7,6
You often do not need a referral — your local school district can evaluate a child age 3 and older, and you can find a certified SLP through ASHA’s directory.9,5
Frequently asked questions
How do you make the Z sound?＋
Use the exact same mouth position as S — tongue tip just behind the upper front teeth (or low behind the bottom teeth), teeth almost together, and a thin stream of air down the middle of the tongue — then turn your voice on so the throat buzzes. S is air only; Z is that same hiss with voice added.
When should a child be able to say the Z sound?＋
Z is part of the same “sibilant” family as S and tends to develop around the same time — most children produce a clear Z by about age 4 to 5, sometimes a bit later. Because Z shows up less often in early words than S, some children simply get less practice with it at first.
Why does my child say “s” for “z”?＋
Saying “s” for “z” (“soo” for “zoo,” “busy” losing its buzz) is called devoicing — the child makes the right mouth shape but forgets to turn the voice on. It’s common because S and Z look and feel almost identical; the only difference is the voice. The fix is helping your child feel the throat buzz.
Can a child lisp on Z as well as S?＋
Yes. Because Z shares S’s mouth position, the same lisps apply: a frontal lisp pushes the tongue between the teeth (Z sounds like a voiced “th”), and a lateral lisp lets air spill over the sides for a wet, “slushy” Z. If you hear a lisp on S, you’ll usually hear it on Z too.
When should I see a speech therapist about the Z sound?＋
Consider an evaluation if Z (and S) errors persist past about age 4½ to 5, if you hear a wet “slushy” lateral lisp at any age, if your child is hard to understand, or if home practice isn’t helping. Because S and Z are a pair, therapy usually addresses them together.
Put this into practice today
Try the free free z sound practice, or start daily AI speech practice — every child takes one SpeechStep at a time.
References
10 sources from authoritative bodies. Last reviewed July 2026.
- 1.ASHASpeech Sound Disorders: Articulation and Phonology — Practice Portal page.
- 2.ASHASelected Phonological Patterns — Practice Portal page.
- 3.ASHACommunication Milestones: 4 to 5 Years — Developmental milestones.
- 4.ASHATypical Speech and Language Development — Consumer page.
- 5.ASHASpeech Sound Disorders — Consumer page.
- 6.NIDCDSpeech and Language Developmental Milestones — Fact sheet.
- 7.ASHATelepractice — Practice Portal page.
- 8.ASHAScope of Practice in Speech-Language Pathology — Policy document.
- 9.ASHAASHA ProFind — Find a Certified SLP — Clinician directory.
- 10.Peer-reviewedCrowe & McLeod — Children’s English Consonant Acquisition in the United States: A Review — Systematic review (AJSLP), 2020.