I know that overgeneralisation is a controversial topic in the study of language acquisition, but here is an example: Zoe (4yo) used to say “even better”, but recently she started to say “even gooder”.

An interesting topic I studied in an animal behaviour class was about the concept of culture in animal societies. I started to think about the transmission of culture recently because I noticed that my 4yo daughter Zoe’s childcare playgroup has developed their own culture. When Zoe started to use a new word, I used to assumed that she learned it from the childcare educators. But recently I noticed that the children are teaching each other.
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