Blow until the victim's chest rises. Listen for air being passively exhaled. Repeat with full breaths 12 times a minute. Children get smaller breaths, repeated at 20 times per minute. It is recommended when it is impossible to ventilate through the victim's mouth, when the mouth cannot be opened, or when the mouth is seriously injured.
Air is blown into the victim's nose.
The mouth may need to be dropped open to allow the victim to passively exhale. A combined mouth and nose resuscitation is used for infants. Here, the rescuer's mouth is placed over the infant's mouth and nose. If the victim does not exhale passively, or his or her chest does not rise, the rescuer should assume the air passage is still blocked. Reposition the head and airway.