During cardiac arrest in a 3-month-old, how should you perform chest compressions?

In performing chest compressions on a 3-month-old infant during cardiac arrest, utilizing the two thumbs with encircling hands method is the most effective approach. This technique allows for a more stable and efficient delivery of compressions due to the positioning and support it provides.

Using the two thumbs allows for greater force and depth of compressions while minimizing the risk of injury to the infant's rib cage, which is more delicate than that of an adult. The encircling hands provide additional support, ensuring that both the chest and the child are stabilized, which is crucial during resuscitation efforts.

This method also maintains a consistent compression rate and depth, adhering to the guidelines established for pediatric resuscitation, where effective compressions are vital to maintaining circulatory flow and improving chances of return of spontaneous circulation. Proper technique and positioning are key to delivering effective care in such critical situations.