Contamination of cord blood with maternal blood during delivery.
D000017:ABO Blood-Group System; D000328:Adult; D001769:Blood; D001789:Blood Group Antigens; D002585:Cesarean Section; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007743:Labor, Obstetric; D008297:Male; D008431:Maternal-Fetal Exchange; D007744:Obstetric Labor Complications / Q000097:blood; D010920:Placenta; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D014470:Umbilical Cord
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D012204:Rh-Hr Blood-Group System