When to Worry About Speech and Language Delays
Key takeaways
- By around 12 months, most toddlers say about 3 clear words and follow simple one-step instructions.
- By around 18 months, most use 10-20 words, including names, and start combining two words together, like 'all gone'.
- By age 2, a vocabulary of roughly 100-200 words and joining words into short phrases is typical.
- Unclear pronunciation is genuinely normal through much of the second year — it's a persistent, ongoing problem that's worth assessing, not the occasional mispronounced word.
- A health visitor is usually the right first point of contact for concerns about a child under 5, before a GP referral or speech therapy assessment.
Speech delays are common enough, and improve on their own often enough, that it’s easy to either worry too early or not raise a genuine concern soon enough. Knowing the real thresholds — and the right first step — helps with both.
The general pattern, by age
By around 12 months: most toddlers understand single words and simple gestured questions, follow one-step instructions like “bring me your teddy,” and say around 3 clear words themselves, such as “mama,” “dada,” or a familiar object’s name.
By around 18 months: most follow two-key-word instructions and understand simple action words like “sit down.” Speaking typically expands to 10-20 words, including names, and children often begin combining two words together, like “all gone.”
By around 2 years: a core vocabulary of roughly 100-200 words is typical, along with joining words into short two-word phrases regularly.
What’s normal, even when it sounds off
Unclear pronunciation is genuinely common through much of the second year of life — plenty of perfectly on-track toddlers mangle certain sounds, drop syllables, or are only clearly understood by their own parents for a good while. This is expected, not a warning sign on its own. It’s a persistent problem — one that continues rather than gradually improving — that’s worth having assessed, not the occasional unclear word or a phase of mispronouncing a specific sound. Every toddler reaches milestones like this at their own pace, and speech is one of the areas with the widest normal range.
What’s worth raising
If your toddler consistently falls well behind these general ranges — very few words by 18 months to 2 years, no attempt at combining words by 2 to 2 and a half, or speech that isn’t improving in clarity over time rather than gradually getting easier to understand — it’s worth raising with a professional rather than waiting to see if it resolves on its own.
The right first step
For a child under 5, a health visitor is usually the right first point of contact, not a specialist referral straight away. They can talk through your specific concerns, offer practical advice, and refer on to a speech and language therapist or arrange a hearing check if that seems like the right next step. Hearing is worth ruling out early in this process, since a hearing difficulty can look, on the surface, exactly like a speech or language delay.
What actually helps at home in the meantime
A few small, consistent habits genuinely support speech development while you wait for any appointment or simply as ongoing good practice: setting aside a few minutes each day for undistracted talking and play, with the TV or radio off so your child can properly hear you; repeating words back correctly without directly correcting them — if they say “tar,” responding with “yes, car” rather than “no, it’s car”; and playing simple listening games that focus on sounds they find harder to produce. Reading and talking through picture books together is another genuinely useful, low-pressure way to build this in, and it doubles as a good bonding habit during any other big family transition too.
It’s also worth remembering that a stressful family change — like the arrival of a new sibling — can cause a temporary dip in speech clarity or vocabulary use that isn’t the same as a genuine ongoing delay, much like other developmental skills can briefly regress under stress before returning to their usual trajectory.
Frequently asked questions
How many words should a toddler have by 18 months?
Typically 10-20 words, including names, often with the beginnings of combining two words together, like “all gone.” This varies meaningfully between children.
Is unclear speech in toddlers always a sign of a problem?
No — unclear pronunciation is genuinely common through much of the second year. It’s a persistent pattern that isn’t improving over time that’s worth assessing, not an occasional mispronunciation.
Who should I contact first if I’m concerned about my toddler’s speech?
A health visitor, for a child under 5 — they can discuss your specific concerns, offer guidance, and refer you on to a speech and language therapist or a hearing test if needed.
Could a hearing problem be mistaken for a speech delay?
Yes — a hearing difficulty can look very similar to a language delay on the surface, which is part of why ruling out hearing early in the assessment process matters.
What can I do at home while waiting for an appointment?
Set aside distraction-free time each day to talk and play together, repeat words back correctly without direct correction, and play simple sound-based listening games focused on the sounds your child finds trickiest.
References
- Great Ormond Street Hospital — Speech and language development (12 to 24 months). gosh.nhs.uk
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