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 with a chin lift.

If the airway is blocked:

Place them in the recovery position, with their mouth slightly downward. Open their mouth and clear the airway with your fingers. Once cleared, tilt the head with a chin lift to open the airway.