When performing chest compressions on a child (over 1 year old), you should press down about 5 cm (approximately 2 inches), which is roughly one-third of the chest's diameter. Use the heel of one hand (or both hands if needed for larger children or rescuers) placed on the lower half of the breastbone, keeping your arms straight and positioning yourself vertically above the chest. Compressions should be done hard and fast at a rate of 100 to 120 per minute, allowing the chest to fully recoil between compressions. This depth ensures effective blood circulation during CPR on a child.

For infants under 1 year, the compression depth is about 4 cm, using two fingers or the heel of one hand if necessary.

This guidance is aligned with current CPR protocols designed to maximize the chances of survival and minimize injury during pediatric resuscitation.