Final answer:
The Moro reflex is present in infants from birth until about three or four months of age. The grasping reflex is present until about five or six months of age.
Step-by-step explanation:
The Moro reflex is an instinctive behavior that is normally present in an infant from birth up until about three or four months of age. It occurs in response to a sudden loss of support when the infant feels as though it is falling. The grasping reflex is the instinctive grasping of a finger or other object that is placed in the palm of an infant. This reflex actually arises before birth and is present until an infant is about five or six months of age.