Which finger should be used for a finger sweep in a choking infant?

The recommended finger for performing a finger sweep in a choking infant is the index finger. This choice is appropriate because the index finger is long enough to reach into the infant's mouth while still allowing the rescuer to maintain control and visibility. The index finger also fits comfortably in smaller mouths, which helps in safely sweeping out any obstructive material without causing injury to the delicate tissues inside an infant's mouth.

Using the middle finger or pinky finger may not provide the same level of effectiveness or control. The middle finger is generally bulkier and could also be less precise, while the pinky finger is not ideally shaped to effectively remove an obstruction. The thumb, while strong, is not suitable for this specific action as it does not provide the necessary reach or dexterity needed to perform a finger sweep effectively.