Final answer:
Each rescue breath given to a child should last about one second, which is long enough to make the chest visibly rise, indicating proper air delivery. The child's age-related respiratory rate decreases from infancy to adolescence.
Step-by-step explanation:
When giving rescue breaths to a child, each breath should last approximately one second. This duration is sufficient to make the child's chest visibly rise, which indicates that their lungs are being filled with air. It's essential to remember that the normal respiratory rate of a child decreases from birth to adolescence, with infants having a rate of 30 to 60 breaths per minute and older children and teenagers having a rate closer to adult breathing rates. In emergency situations, prompt initiation of CPR is crucial for survival, and this includes delivering effective rescue breaths when necessary.