 It has to always do with back slaps, which you should not do unless you're working with infants. With infants, when they're choking, when the airway is completely obstructed, you're going to be doing both compressions as well as back slaps alternating, and you don't do that with adults and children. So that's really the main differences is depth of compressions. And with children, if you are alone, you'll want to call 911 immediately