Open their mouth to check if the airway is clear. A blockage could be caused by the back of the tongue or foreign material.

If the airway is clear:

Leave or place them on their back and open the airway by tilting the head gently (with a chin lift) into a neutral position.

If the airway is blocked:

Place them face down on your forearm with the head supported and mouth slightly downward. Clear the airway with your little finger.

Once the airway is cleared, open the airway by tilting the head gently into a neutral position.