place the 2 fingers in the centre of the breastbone (sternum)
compress the sternum to depress it by at least one third of the depth of the chest – which is approximately 4 cms – and at a speed of 100-120 compressions per minute
after giving 30 chest compressions give 2 rescue breaths
repeat the sequence of 30:2
continue with CPR (30:2) until the emergency services take over from you, your casualty recovers or you become too exhausted to continue

FOR CHILDREN OVER THE AGE OF 1 YEAR

Place the heel of one hand on the lower half of the breastbone (sternum)
Lift the fingers to ensure that pressure is not applied over their ribs
Position yourself vertically above their chest and with your arm straight, compress the sternum to depress it by at least one third of the depth of the chest, which is approximately 5cms, and at a speed of 100-120 compressions per minute
For larger children or for small rescuers, this may be achieved most easily by using both hands with the fingers interlocked

After giving 30 chest compressions, give 2 rescue breaths
Repeat the sequence of 30:2
Continue with CPR (30:2) until the emergency services take over from you, your casualty recovers or you become too exhausted to continue

The following demonstrates Infant CPR.

The following demonstrates Child CPR