And for babies you are still supposed to do the rescue breaths (we dont' call it mouth-to-mouth anymore, that scares people), 2 per 30 compressions. But for adults the chest compressions are enough.

Part of the push for this is to get people who are scared of the mouth-to-mouth part to be willing to do the chest part.

Anybody remember the song about mouth to mouth resuscitation good for the country good for the nation nothing a-quickens your respiration like a little ol' bit of that sweet sensation that mouth to mouth (gasp) resuscitation...