For which of the following children would pediatric AED pads be used?

Pediatric AED pads are specifically designed for use on smaller children and infants because their hearts and bodies differ significantly from those of adults. The guidelines for when to use pediatric AED pads generally support their use in children who are under 8 years old or weigh less than 55 pounds.

In this case, the 5-year-old weighing 43 lbs falls within the acceptable age and weight range for pediatric pads. Using these pads helps deliver a lower dose of energy, which is crucial for effectively treating a child's heart in a safe manner. These pads often have different electrode placements and energy settings tailored explicitly for younger patients, enhancing the likelihood of a successful shock while minimizing potential harm.

The other children in the options either exceed the age or weight limits that indicate the need for pediatric pads, making their use inappropriate for those situations. Therefore, the choice of the 5-year-old is justified based on the established guidelines for pediatric resuscitation.