What technique should be used when performing CPR on an unresponsive choking infant?

The encircling thumbs CPR technique is the correct approach for performing CPR on an unresponsive choking infant because it addresses the specific airway management needs of a small child while also providing effective chest compressions. This technique involves positioning both of the caregiver's hands around the infant's chest, using the thumbs to deliver compressions and the fingers to support the back of the infant.

Using the encircling thumbs method allows for better stabilization of the infant's body and facilitates easier access to the thoracic region while ensuring that the airway remains clear and accessible for rescue breaths, especially important in a choking situation.

In contrast, standard CPR techniques may not be immediately applicable to infants due to their anatomical differences compared to older children and adults. One-handed CPR techniques and two-handed compressions are generally more relevant for older children and adults and may not be safe or effective for infants, as they can lead to excessive force and potential injury.