The word "toddler" has been defined by the American Academy of Pediatrics to include children 1 and 2 years of age. IQ testing is typically not recommended for children under the age of 4. School districts and psychologists in private practice are better resources for assessing a child's intellectual ability.
One reason to avoid IQ testing in very young children is that scores obtained before age 4 have been shown less often to remain consistent with scores from repeated testing at later ages. Experts have also questioned the ability of a single measurement derived from IQ testing to reflect an individual's general intelligence.
Reasons for questioning the usefulness of IQ include the possibility of unintended biases preventing manifestation of true ability by people from certain cultural backgrounds, the theory of multiple intelligences advocated by psychologist Howard Gardner, and discrepancies between the tested IQ and actual achievement of many individuals.