Final answer:
The accurate instruction given by the nurse is, 'My infant needs to remain in the harness at all times.'
Step-by-step explanation:
The accurate instruction given by the nurse is option 4: My infant needs to remain in the harness at all times. The Pavlik harness is used to treat hip dysplasia in infants by keeping the hips in the correct position. It is important to keep the harness on at all times to ensure effective treatment and proper hip development. The harness should only be removed by a healthcare professional for specific reasons, such as cleaning or adjusting.