Mai and Clifton are both sitting upright on an experimenter's lap and are presented with an interesting toy that is slightly beyond their reach. Although Clifton attempts to lean forward to grab the object, Mai does not, knowing it is too far away. Based on your knowledge of the development of reaching, you could conclude that

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Clifton's attempt to reach for the toy suggests he may not yet have developed the ability to accurately judge distance, which is typical of younger infants. Mai's understanding that the toy is out of reach indicates more advanced perceptual and motor skills, suggesting she is likely older.

Mai and Clifton Are Both Sitting Upright on an Experimenter's