For infants, what is the preferred method for chest compressions when two providers are present?

When performing chest compressions on infants in a two-provider scenario, using two thumbs is the preferred method. This technique, often referred to as the "two-thumb encircling technique," allows for effective and stable compressions while supporting the infant's back with the fingers of the hands encircling the chest.

By utilizing two thumbs, both providers can deliver simultaneous compressions, ensuring a consistent and forceful rhythm that is critical for maintaining adequate blood circulation during a cardiac emergency. This approach also minimizes the risk of accidentally injuring the infant's ribs or organs, which is especially important given their delicate anatomy.

Other methods, such as using one hand or the heel of one hand, may not provide the same level of control or efficiency, and using the fingers of one hand lacks the power and stability necessary for effective compressions in an emergency setting. Thus, the two thumbs method is the most effective and recommended for providing high-quality CPR to infants with two providers involved.