No, not by a long shot. Mental retardation involves an extra chromosome and is present at birth. Or, a severe illness (like lengthy high fever) can cause some mental defects in children. Mental...
Mental retardation is a developmental disability that first appears in children under the age of 18. It is defined as an intellectual functioning level (as measured by standard tests for intelligence...
The English word 'mental' has a few senses: 1: affected by a disorder of the mind; 2: of or relating to the chin or median part of the lower jaw; 3: involving the mind or an intellectual process; ...