“How to prepare a child for anesthesia?”

First of all, do not lie to him. Try to explain in a simple and honest manner. Take him to anesthesia pre-op evaluation. It's very important. Keep npo after mn of surgery. No food no water.

My advice is to be truthful and straight forward about the event. Most pediatric surgery suite give adequate and simple explanation of the day. Most important is that child knows that you are going to be with them every step of the way and he will also be given medication to help relax before surgery.