CPR is the same for children.  But their are some minor differences to be aware of.

•  Smaller lung capacity.  (give less of a breath for smaller people, only enough breath to make the chest rise)  

•  If pulse is less then 60bpm.  (if a child has a pulse of 60bpm or less, ignore the pulse and begin CPR)  With adults any pulse is acceptable.

•  When calling for help.  Children in most cases are unresponsive due to a respiratory issue.  So if you alone with that child start your steps of CPR and continue with 5 cycles.  After your 5 cycles are complete call for help.  (remember 5 cycles is averaged out to about 2 minutes, so help the child for about 2 minutes then call for help)

•  Compression depth is different.  Compress at 1/2 the depth of the chest.  (this is not 1/2 an inch, this is 1/2 the depth of the child's chest, we are actually going deeper with compressions on children then adults)  (children are still developing and are less  likely to have there bones broken)

•  1 hand CPR is optional for children.  Use 2 hands if you're tired or losing effectiveness.

The new motto for the American Heart Association is FASTER AND DEEPER.

This is what the American Heart Association describes children as.

•  Girls with breast development.

•  Boys with underarm hair.

Here's what my suggestion is.

Look at the size of the child.  If that child is less than 100lbs treat them like a child.  If the child is more then 100lbs treat them more like an adult.  A good example would be a 6 year old that weights 120lbs.  This child has an adult size body and will most likely have adult type issues.

1)  Check for response

2)  Activate emergency response and call for AED (remember if your alone call after 5 cycles)

3)  Open airway using head tilt-chin lift

4)  Check for breathing for (5 to 10 seconds)

5)  Give 2 breaths (look to see if check is rising)

6)  Check pulse for (5 to 10 seconds)

7)  Begin chest compressions

30 compressions and two breaths for 5 cycles.  This averages about 2 minute's time.  After you 5 cycles are complete, you are to reassess the victim and determine if more CPR is needed.