Final answer:
The first rescuer should assess the scene, check for responsiveness and breathing, perform chest compressions and rescue breaths, and use an AED if available.
Step-by-step explanation:
The first rescuer who arrives at the side of an unresponsive infant or child should perform the following steps:
- Assess the scene for safety. Ensure that there are no immediate dangers and take necessary precautions.
- Check for responsiveness by tapping the child's shoulder and shouting loudly.
- If the child is unresponsive, call emergency medical services immediately.
- Check for breathing by looking, listening, and feeling for any signs of breathing.
- If the child is not breathing, begin chest compressions by placing two fingers on the center of their chest and pressing down about 1.5 inches with quick, firm compressions.
- Continue chest compressions at a rate of 100-120 compressions per minute, alternating with rescue breaths.
- If an AED is available, use it as soon as possible, following the instructions.
- Continue performing CPR until medical help arrives or the child starts breathing.