Final answer:
In CPR for a 6-month-old infant weighing 17 pounds, the appropriate compression depth is about 1½ inches deep. High-quality chest compressions are vital, and the method involves using two fingers on the infant's sternum.
Step-by-step explanation:
When performing cardiopulmonary resuscitation (CPR) on an infant, such as a 6-month-old who weighs 17 pounds, the appropriate compression depth is different than that of an adult. Current standards for infants suggest compressions should be about 1½ inches (approximately 4 cm) deep. It is important to perform high-quality chest compressions to ensure effective CPR, and this involves using two fingers for an infant, pressing down on the sternum just below the nipple line.