Satoru Takeda, Shintaro Makino, Jun Takeda, Naohiro Kanayama, Takahiko Kubo, Akihito Nakai, Shunji Suzuki, Hiroyuki Seki, Katsuo Terui, Shoichi Inaba and Shigeki Miyata Japan Society of Obstetrics and Gynecology, Japan Association of Obstetricians and Gynecologists, Japan Society of Perinatal and Neonatal Medicine, Japanese Society of Anesthesiologists, Japan Society of Transfusion Medicine and Cell Therapy, Shirota Clinic, Department of Obstetrics and Gynecology, Juntendo University, Department of Obstetrics and Gynecology, Nippon Medical School Tama Nagayama Hospital, and Japanese Red Cross Katsushika Maternity Hospital, Tokyo, The Japanese Red Cross Kanto‐Koshinetsu Cord Blood Bank, Kanagawa, Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine, Shizuoka, Departments of Obstetrics and Gynecology, Anesthesia, Saitama Medical Center, Saitama, and Division of Transfusion Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan