Is CPR different for a 7 year old than an adult?

Yes, CPR is different for a 7 year old and an adult. A 7 year old has smaller lungs and a much weaker chest. Much less pressure is needed. The finger sweep is even more important. 7 year olds are likely to have stuck anything and everything in their mouths. This junk could be clogging their throats. Clean out their mouths.