Concerning your wish not to have more children, your doctor would like you to become more familiar with a sterilization operation which is sometimes called "having your tubes tied." The formal name is post-partum bilateral tubal ligation, or BTL. Bilateral means both sides, and tubal ligation means "blocking" the fallopian tubes so your eggs cannot be fertilized or reach the uterus. his is how BTL prevents pregnancy.
There are many forms of birth control that you may have used in the past. However, now that you are finished with your childbearing, you may desire a more permanent method of birth control. This is why your doctor would like you to become familiar with a post partum tubal ligation, which should be thought of as a permanent method of birth control.