Overgeneralization

The overgeneralization occurs when children treat irregular verbs and nouns as if they were regular.
Such as bringed, goed, grawed and runned or foots mouses and sheeps.
In fact, children may go through three stages in the acquisition of an irregular form:

Stage 1                                      Stage 2                                         Stage 3
broke                                          breaked                                        broke
brought                                       bringed                                        brought