Overregularization refers to a young child's tendency to apply grammar rules when he or she should not—when exceptions to those rules should be honoured.
Theory is a child's proclivity to generate theories to explain everything they encounter. This concept implies that humans are wired to look for reasons and generate explanations for why things happen.
They may repeat the words of people they know (parents, teachers), or they may repeat sentences from a favourite video. Immediate echolalia occurs when children repeat words immediately after hearing them.
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