Final answer:
The nurse should assess the pin sites for signs of infection to prevent complications in a child in Buck's traction. Loosening the traction or removing it for a few hours is not recommended.
Step-by-step explanation:
The nurse should take the action to assess the pin sites for signs of infection to prevent complications in a child who has been in Buck's traction for 2 days. Pin site infection is a common complication of traction, and it is important to monitor for any redness, swelling, warmth, or drainage at the pin sites. If an infection is suspected, the healthcare provider should be notified for further evaluation and treatment.
Loosening the traction to allow for more movement (Option A) may compromise the effectiveness of the traction and lead to inadequate fracture alignment. Elevating the foot of the bed to promote venous return (Option B) is not directly related to preventing complications specifically related to Buck's traction. Removing the traction for a few hours each day (Option D) is also not recommended, as it disrupts the continuous immobilization necessary for effective traction.