<p>Philips HeartStart Onsite AED Defibrillator Infant/Child Replacement Pads Cartridge-Item #M5072A Children under 8 years of age or weighing less than 55 pounds (25 kg), including infants, should be treated using HeartStart Infant/Child SMART Pads. These pads instruct the defibrillator to reduce the energy of its shock from 150 to 50 Joules (J), a more appropriate dosage.</p>