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POPSNew Math Theory Explains Toddler's "Word Spurt" A bell-shaped word distribution and a steady child learning rate turn out to be enough to bring about the extraordinary explosion seen in children's vocabularies around this age. McMurray notes that languages have only a small number of very easy-to-learn words and many more intermediate words. So when a baby has been exposed to enough language to learn the easy words, she will acquire just a few words. As she is exposed to more language, she begins to learn the medium words. And because there are a lot of medium words, she is likely to pick up a lot of words at this stage. This, McMurray says, is the vocabulary explosion.
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