Fortunately, in today's hospitals and surgical centers, highly trained professionals use a wide variety of safe, modern medications and extremely capable monitoring technology. An anesthesiologist is a doctor who specializes in giving and managing anesthetics — the medicines that numb an area of the body or help a person fall asleep and stay asleep. A pediatric anesthesiologist has additional specialized training that certifies him or her to care for children.
You can request to speak to your son's anesthesiologist directly and ask him or her specific questions that you may have and I'm he or she will be able to help you understand the process more clearly.
I hope this helps. I pray for safe surgery for your son. Mom, be calm I believe your son will be fine. Peace and Blessings!