What factors affect the test-retest reliability of the tests designed to measure the developing cognitive and motor skills of infants?

What factors affect the test-retest reliability of the tests designed to measure the developing cognitive and motor skills of infants?

Please use standard intro/body/conclusion format.

Material is attached.

Text for reference is:
Psychological Testing and Assessment: An Introduction to Tests and Measurement
Ronald Jay Cohen & Mark E. Swerdlik, 2018
McGraw-Hill Education

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