Recently I had a very frightening experience when my preschooler choked during lunch. Thanks to CPR training courses I took over 15 years ago I was able to perform the Heimlich Maneuver and saved his life.
It all happened so fast and it scares me to think of the times I've walked to another room while he was munching on a snack. The whole incident took less than two minutes, but of course during the episode it felt like hours!
Here's a great website full of step by step resources for performing CPR on infants, children and adults. I encourage you to print out copies of the diagrams for CPR and the Heimlich to leave with your baby sitter and post on your refrigerator. It may just save your child's life (or your own)!
FYI: There's also a new method for adult CPR using hands only, no breaths.