What is the term that indicates that toddlers apply grammatical rules even to words that are an exception to the rule, such as 'mouses' for mice and 'foots' for feet?

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Overregularisation is the term used to describe when toddlers apply grammatical rules even to words that are an exception to the rule. This results in words like 'mouses' for mice and 'foots' for feet. Underregularisation, on the other hand, is when toddlers apply a rule inconsistently, resulting in errors such as saying 'goed' instead of 'went'. Hypergeneralisation and hypogeneralisation are not related to this phenomenon.

What Is the Term That Indicates That Toddlers Apply Grammatical