c7f1ccc7___open_books_for_an_open_world__Response
[Reflex] Palmar grasp [Stimulation] Place the finger in baby's palm and press against the palm. [Age of disappearance] 3 to 4 months [Function] This prepares infant for voluntary grasping. [Response] 
The baby will immediately grasp the finger.
Human Physiology/Print Version - Wikibooks, open books for an open world