Final answer:
The Moro reflex is present in infants from birth until about 3-4 months of age and helps them reach out for support when they feel as though they're falling. The grasping reflex is also present from birth and helps infants grip onto their caregiver.
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 reflex involves suddenly spreading out the arms, bringing them back in toward the body, and usually crying. This reflex helps the infant reach out for support if they were really falling. Another reflex in infants is the grasping reflex, which involves instinctively grasping a finger or object that is placed in their palm. This reflex is present from birth and lasts until about five or six months of age, helping the infant grip onto their caregiver.