Milestones
Speech and Language Milestones: 24–36 Months
The third year is often when parents start to see language take off — or when concerns that were present earlier become clearer. Children who have been quiet may suddenly have a lot to say. Children who were using words may begin putting them together into sentences. The range of what’s typical remains wide, but the benchmarks become more specific.
Around
24 – 30 months
Many children in this range are using two- and three-word phrases regularly. Vocabulary is growing quickly — some children add multiple new words a week during a “vocabulary explosion” that often happens somewhere between 18 and 24 months. They ask simple questions (“what’s that?”). Familiar adults can typically understand a good portion of what they say, though speech is still developing and strangers may find them harder to follow.
Sources: CDC MilestonesASHA
Around
30 – 36 months
By 36 months, many children are speaking in sentences of three or more words. They follow two-step instructions that aren’t related (“get your shoes and put them by the door”). They talk with adults back and forth in short conversations. Strangers can understand around three-quarters of what they say, even if not every word is clear.
Many children in this range also begin asking “why” questions — the start of a period that can feel endless.
Sources: CDC MilestonesASHA
Speech intelligibility in this window
Speech clarity is a separate dimension from vocabulary and sentence length. Many children at 2–3 years are still developing certain sounds and are not fully intelligible even to familiar adults. This is normal — but there are useful benchmarks:
- Around 24 months: familiar adults understand roughly half or more of what a child says
- Around 36 months: strangers understand around three-quarters of what a child says
If a child’s speech is harder to understand than these benchmarks suggest, that’s a reason to mention it — separate from any language delay concerns.
What to watch for
Worth discussing with a paediatrician:
- Fewer than 50 words at 24 months or no two-word phrases
- Sentences of fewer than three words by 36 months
- Hard for strangers to understand most of what a child says by 36 months
- Not following two-step instructions by 36 months
- Loss of previously-used words at any point
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Next: 3–5 years →