Step 4: Give 30 chest compressions
Start compressions as soon as you can. Place the heel of one hand in the centre of their chest. Place the other hand on top of the first. Interlock your fingers.
With straight arms, use the heel of your hand to push the breastbone down firmly and smoothly, so that the chest is pressed down between 5–6 cm, and release.
Do this at a rate of 100 to 120 chest compressions per minute – that’s around 2 per second.