At one or two years of age if a toddler has an average vocabulary size of 200 words,you would estimate that at five years of age he'd have 10 times that amount or more words in his vocabulary.

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Quizplus · Accepted Answer

This is a commonly used estimate in language development research. By five years of age, a typically developing child is expected to have a vocabulary of around 2000-2500 words.

At One or Two Years of Age If a Toddler