21 weeker?! Most hospitals would have let them go. Statistics are not on their side. Just check out the mortality and morbidity rate. http://www.preemiesurvival.org/info/ In addition to 更多研究和临床的突破, may also due to the parents' will. Some parents want everything possible (not necessarily reasonable) to be done. Unfortunately, most of the extremely preemie babies still die after suffering from tremendous pain. May they RIP.