Final answer:
At 4 months old, the nurse would anticipate finding the motor skill of holding a rattle in the infant.
Step-by-step explanation:
At 4 months old, the nurse would anticipate finding the motor skill of holding a rattle in the infant. By this age, infants have developed the ability to grasp objects with their hands. They may not have the dexterity to manipulate objects in complex ways yet, but they can hold onto and explore objects like rattles.