Speech and Language Development in Children
Speech and language are two different things, and the distinction matters when you're trying to work out what kind of help your child needs. Speech is the physical production of sounds — how words come out. Language is the system of meaning underneath: understanding what's said, and putting words together to say something back. A child can have clear speech and a language difficulty, or good language and unclear speech. Speech-language pathologists assess and treat both, along with fluency, voice, and social communication. If you're worried about your child's communication, you don't need a referral to raise it — in the US, children under three can be referred to early intervention by a parent directly.
Speech and language are not the same thing
| Speech | Language | |
|---|---|---|
| What it is | Producing sounds | Understanding and using words to convey meaning |
| Sounds like | "Wabbit" for "rabbit" · stuttering · hoarse voice | Short sentences · not following instructions · struggling to find words |
| Difficulty looks like | Hard to understand, but clearly has something to say | Speaks clearly, but says less or understands less than expected |
Five areas a speech-language pathologist covers
Speech sounds — how sounds are produced. Includes articulation and phonological difficulties, and apraxia of speech, where the difficulty is in planning the movements rather than making them. See also lisp.
Language — split into two halves that can develop unevenly. Receptive is understanding; expressive is using. A child who follows complex instructions but speaks in two-word phrases has an expressive difficulty. See language disorders and language processing disorder.
Fluency — the rhythm and flow of speech. See stuttering.
Voice — pitch, volume, and quality. Persistent hoarseness in a child is worth a referral rather than waiting.
Social communication — using language appropriately in context. Relevant to autistic children, and to gestalt language processing.
Milestones
Guidance from the American Speech-Language-Hearing Association. These are averages, not deadlines — but a child missing several is worth a conversation.
By 12 months — babbles, responds to their name, tries to imitate sounds, uses simple gestures such as waving and pointing
By 18 months — says several single words, understands simple instructions, points to objects when named
By 2 years — combines two words ("more juice"), follows two-step instructions, and uses a growing spoken vocabulary (around 50 words is typically reached somewhere between 24 and 30 months)
By 3 years — speech others can understand most of the time, uses simple sentences, asks questions. (Being fully clear to unfamiliar listeners usually comes closer to age 4.)
One caveat. How a child is progressing matters more than any single date. A child who was slow at two and is adding words steadily at two and a half looks different from one who has stalled. Direction of travel is the useful signal.
Late talkers
A child is generally described as a late talker when, by 24 months, they use fewer than 50 words and haven't started combining two words together.
The important detail: a true late talker is age-appropriate in every other area. They understand instructions, use gestures like pointing and waving, engage in pretend play, and meet other developmental milestones on time. The gap is in expressive language only.
How common: ASHA's prevalence estimates for two-year-olds range between 10% and 20%. Around 13.5% of 18–23-month-olds are late talkers, rising to 16–17.5% at 30–36 months.
Do they catch up? Many do. Some don't — and research has found late language emergence at 24 months to be a risk indicator for language impairment at age seven.
The honest part: nobody can reliably tell you in advance which group your child is in. That uncertainty is why "wait and see" is a harder position to defend than it sounds.
Three approaches you'll encounter:
- Wait and see — no action, revisit when the child is older
- Watch and see — monitor and re-evaluate every three to six months
- Early intervention — active support now
Watching and early intervention are both defensible. Doing nothing is the weakest of the three, particularly given that assessment is free for under-threes in the US and carries no downside.
Signs that make evaluation more clearly worthwhile, if they persist past 18 months: limited babbling or jargon; not imitating words (no "buh" for "book"); few early consonant sounds (m, b, p, t); limited pointing or other symbolic gestures; a history of ear infections, since hearing is the foundation for spoken language.
If your family speaks more than one language
Being bilingual does not cause language delay. This is worth stating plainly, because families are still routinely advised to drop a home language.
ASHA takes a strengths-based position: learning two or more languages does not inhibit language development or worsen outcomes for children with communication difficulties. Bilingual exposure has not been found to inhibit language development, bilingual late talkers make similar progress to monolingual peers, and dual-language exposure does not worsen outcomes for children with language concerns. There is no evidence that late language emergence is more common among bilingual children.
What this means practically:
- Don't drop your home language on anyone's advice. You'd be removing a source of rich input and, often, the language your child connects with family in.
- Vocabulary should be counted across both languages, not English alone — otherwise an assessment underestimates what a bilingual child actually knows.
- Assessment should account for both languages. If it doesn't, say so.
- If a professional tells you bilingualism is the problem, it's reasonable to ask what they're basing that on.
When to seek an evaluation
Talk to your pediatrician or request an evaluation if your child isn't meeting the milestones above (particularly several of them), is still hard for unfamiliar people to understand by around age four, seems frustrated trying to communicate, isn't using gestures (pointing especially), isn't responding to their name or to sounds, or has a hoarse or unusual voice that persists.
Loss of skills needs prompt attention
If your child has stopped using words, gestures, or social skills they previously had, contact your pediatrician promptly. Regression warrants medical evaluation regardless of what else is going on. See developmental regression.
Get hearing checked. Hearing should be assessed for any speech or language concern. It's straightforward, and hearing loss — including the fluctuating kind from repeated ear infections — is a common and treatable contributor.
How to get an evaluation
Under 3 — early intervention. Every US state runs a free early intervention program under IDEA Part C. You can refer your own child. You don't need a doctor's referral, and evaluation is free regardless of income or insurance. Search "[your state] early intervention".
3 and over — your school district. Public schools are required to evaluate children who may need special education services, including speech and language. Request it in writing. The district must generally complete the evaluation within 60 days of your consent, though some states set their own timeline. Your child doesn't need to be enrolled in that school.
Private assessment. Faster, and useful when waiting lists are long or you don't meet service thresholds. Check what's included and what the report will contain.
Through your pediatrician, who can refer, order a hearing test, and rule out medical causes.
Browse verified providers by city and state.
Browse the DrSensory Therapy Directory →What to expect from speech therapy
- Assessment first — standardized measures, observation, developmental history, hearing check
- Goals in daily-life terms — "asks for what she wants using two words," not "improves expressive language"
- Play-based, for young children. If it doesn't look like therapy, that's usually a good sign
- You're part of it. What happens between sessions does most of the work. A good SLP teaches you what to do at home
- Progress is uneven. Plateaus are normal
Related conditions
Speech and language difficulties frequently occur alongside other things: autism (including gestalt language processing), ADHD, sensory processing differences, auditory processing difficulties, tongue tie (though its role in speech is more limited than commonly claimed), and dyslexia — speech-sound difficulties that persist into school, especially alongside language difficulties, are associated with a higher risk of later reading difficulty, though many children whose speech errors resolve go on to read typically.
Frequently asked questions
What's the difference between speech and language?
Speech is the physical production of sounds. Language is the system of meaning — understanding what's said and putting words together to say something back. A child can have clear speech with a language difficulty, or good language with unclear speech.
When should I worry about my child's speech?
Common points: not babbling or using gestures by 12 months, few single words by 18 months, not combining two words by two years, or being hard for strangers to understand by three. Loss of skills at any age warrants prompt attention.
What is a late talker?
A child who by 24 months uses fewer than 50 words and isn't combining two words, while being age-appropriate in every other area — understanding, gestures, play, and other milestones. Roughly 10 to 20 percent of two-year-olds.
Do late talkers catch up?
Many do. Some don't, and late language emergence at 24 months has been found to be a risk indicator for language impairment at age seven. Nobody can reliably predict which group a child is in, which is why monitoring or early support is preferable to waiting.
Does being bilingual cause speech delay?
No. ASHA holds that learning two or more languages does not inhibit language development or worsen outcomes, and there is no evidence that late language emergence is more common among bilingual children. Don't drop your home language on that basis.
How do I get my child evaluated?
Under three, contact your state's early intervention program — you can refer your own child, and evaluation is free. Three and over, request an evaluation from your school district in writing. Your pediatrician can also refer and arrange a hearing test.
Does my child need a diagnosis to get speech therapy?
Not usually. Early intervention and school-based services work from evaluation results rather than a diagnosis. Private and insurance-covered therapy may have different requirements.
Can tongue tie cause speech problems?
The evidence is more limited than commonly claimed. Restricted tongue movement can affect specific sounds in some children, but tongue tie isn't an established cause of speech disorders and release isn't an established treatment. An SLP assessment should come first.
Sources
- American Speech-Language-Hearing Association — Communication Milestones. asha.org
- American Speech-Language-Hearing Association — Late Language Emergence (Practice Portal). asha.org
- American Speech-Language-Hearing Association — Bilingual Service Delivery (Practice Portal). asha.org
- Taylor CL, Zubrick SR, Rice ML (2013). Population and public health perspectives on late language emergence at 24 months as a risk indicator for language impairment at 7 years. In: Rescorla LA, Dale PS, eds. Late Talkers: Language Development, Interventions, and Outcomes. Baltimore: Paul H. Brookes; 23–40.
Medical disclaimer. General educational purposes only; not medical advice, diagnosis, or treatment. If your child has lost skills they previously had, contact their doctor promptly.