Newborns of immunized mothers are protected through passive immunity and hygiene standards have been improved even in the developing world, so the umbilical cords are usually cut with sterile equipment.

已接受免疫的母亲生下的新生儿可通过被动免疫获得保护，即便在发展中国家，卫生标准也在逐步提高，能够实现使用无菌器械离断脐带。