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What's typical at each age — and the signs worth flagging with your pediatrician
Around the second birthday, most children have ~50 words and start combining them ("more milk", "go car"). By 3, vocabulary explodes to 1,000+ words and 3-4 word sentences. Most family members should understand them most of the time. Flag with your pediatrician if: fewer than 50 words at 24 months, no 2-word combinations by 24 months, or strangers can't understand any speech by 30 months. Read aloud daily — it's the single highest-leverage activity at this age.
By age 4, most children speak in 4-5 word sentences and tell short stories. They make grammatical errors ("I goed there") — that's normal and self-corrects with exposure. By age 5, sentences average 6+ words and grammar mostly clicks into place. Pronunciation refines: most speech sounds are accurate by 5, with R, L, S, TH often the last to mature. Stuttering between 2.5 and 5 is common (developmental dysfluency); it usually resolves on its own.
Three things outperform every paid speech app: read aloud daily (15+ minutes), narrate your day ("I'm chopping the carrots, then we'll mix them with the onions"), and sing every day (melody scaffolds vocabulary acquisition faster than speech). Songs particularly help children whose speech is delayed — speech-language pathologists routinely use nursery rhymes in therapy. If you're worried about delays at any age, ask your pediatrician for a speech-language screening — early support has the best outcomes.
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