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Berko and Brown (1960s)

Adults regularly use this when interacting with children

Age where the rhythm of babbling gives a sense of their native language

Most common early consonants in words

Children don't respond to this

AO2 theory - Katherine Nelson (1973)

Largest collection of childrens words (Katherine Nelson), 60%

This is culturally important to us, in the first 50 words

Necessary to understand the child in the two word stage

Theorist of grammatical development