With first feature, as for this invention, the newborn baby object and/or targeting fetus the case where the medicine which brings pain killing is manufactured it regards the use of xenon. With second feature, as for this invention, targeting newborn baby being the method of bringing pain killing, targeting aforementioned it regards the method of including the fact that it prescribes the xenon of the remedy effective quantity. With 3rd feature, as for this invention, targeting fetus being the method of bringing pain killing, it regards the method of including the fact that it prescribes the xenon of the remedy effective quantity to the mother of the aforementioned fetus object, for both of the aforementioned mother and the fetus object.第一の態様では、本発明は、新生児対象及び/又は胎児対象に鎮痛をもたらす医薬を調製する際のキセノンの使用に関する。第二の態様では、本発明は、新生児対象に鎮痛をもたらす方法であって、前記対象に治療有効量のキセノンを投与することを含む方法に関する。第3の態様では、本発明は、胎児対象に鎮痛をもたらす方法であって、前記胎児対象の母親に、前記母親と胎児対象の両者にとって治療有効量のキセノンを投与することを含む方法に関する。