Final answer:
In 8-9 month old infants, the radial digital grasp is typically seen, characterized by coordinated thumb and finger movements to securely hold objects.
Step-by-step explanation:
The grasp typically seen in 8-9 months old infants is radial digital grasp. This type of grasp involves the opposition movement of the thumb toward the fingers of the same hand, allowing the infant to securely hold objects. Between 8 and 9 months, infants develop the ability to use their thumb in coordination with their fingers to firmly grip an object. Prior to this, younger infants exhibit a palmar grasp, which is one of the few innate behaviors in human beings and is already present at birth. By about ten months, infants improve their dexterity to the point where they are able to execute a pincer grasp, using the tips of the thumb and forefinger.