Conclusion: The mortality is higher in developmental nonidentity twins, early detection and management, or transference to higher level hospital is the key to lower perinatal mortality.

• 结论：发育不一致性双胎围生儿死亡率高。及早发现和处理双胎发育不一致，基层医院必要时转上级医院治疗是降低围生儿死亡率的关键。