Final answer:
The term for when infants grip with the whole hand is the palmar grasp reflex.
Step-by-step explanation:
The correct term for when infants grip with the whole hand is palmar grasp reflex. This reflex is a natural response that allows infants to hold onto objects or their caregiver's finger by using their entire hand. It typically disappears around 5-6 months of age as infants develop more coordinated fine motor skills.