What is the compression depth for an infant during CPR?

The correct depth for performing chest compressions on an infant during CPR is one-third of the chest depth. This guideline is crucial because effective compressions need to be deep enough to generate sufficient blood flow during cardiac arrest, while also being gentle enough to avoid causing injury to the delicate structure of an infant's chest. Infants have a relatively pliable rib cage, so aiming for one-third of the chest depth allows caregivers to provide effective compressions without risking harm.

Using a proportionate depth tailored to the infant's size ensures that the compressions are effective in supporting circulation. This standard is established by current guidelines to enhance the chances of survival and minimize potential injury during CPR.

The other options reflect inappropriate compression depths that could either be insufficient (like one-quarter of the chest depth) or excessive (like half of the chest depth or at least 5 cm), which do not align with the recommended practices for infant CPR.