Yes, but if you have it, you might use it on someone else's child.  And you might be in a position to do 2-person CPR.  And you get 21% O2 into the patient, not 16%.  But yes, it does require training.  But then again, so does most everything that we carry/discuss here.  You and I, personally, are probably a little "spoiled" because of the training and experience that we get on the job.  Others are not so lucky regarding training.
  
_________________________
"We are not allowed to stop thinking"