The steps for performing CPR for infant are slightly different to adult and child.
Difference 1: Administration of CPR prior calling 911. Perform 5 reps of 30 compressions with 2 rescue breaths in between. Once done, then call 911.
Difference 2: Breathing. When performing rescue breathing on infant, make sure you cover the victim's nose as well as mouth.
Difference 3: Circulation Check. After completing first 2 rescue breaths, check if the infant has a pulse by placing your index and middle fingers on the inside of the arm, between the shoulder and elbow.
Difference 4: Chest Compressions. When performing compressions, place 2 fingers on the breastbone (see video for more detail) -- just below the nipples and make sure not to press at the very end of the breastbone. Keep your other hand on the infant's forehead, keeping the head tilted back.
Difference 5: Depth of Compressions. Press down on the infant's chest so that it compresses about 1/3 of the depth of the chest, about 1 1/2 inches.