多胎妊娠异常与单胎妊娠大多相同，但也有其特有的异常表现。
There were similar fetal anomalies between monoparous and multiparous pregnancy , and also some special anomalies in multiparous pregnancy.
结论双胎妊娠胎儿与单胎妊娠胎儿在晚孕期有着不同的生长发育规律。
Conclusion The twin pregnancy and singleton pregnancy have different growth patterns in the third trimester pregnancy.
结果双胎妊娠妊娠期、产时和产后并发症多于单胎妊娠，胎位是决定分娩方式的主要因素。
Results Twin pregnancy had more complications than singleton during in labor and puerperuim Conclusions Antenatal care should be enhanced in twin pregnancy.
结果多胎妊娠孕期及围生儿并发症较单胎明显增多。
Results: the complications of multiple pregnancy were significantly increased than the single births.
一胎于妊娠12～34周死亡者或单卵双胎者，其存活胎婴儿病率增加。
The morbidity of the living fetus was markedly increased in single fetal in 12~34weeks or those in monozygotic twins.
方法对2 584例单胎初产妇，测量孕前身高、体重和孕期体重增加情况，计算体重指数（BWI），并随访妊娠结局。
Methods Body wight index (BWI) was calculated before pregnancy and maternal weight gain and pregnancy outcomes were followed up in 2 584 primipara with singleton births.
双胎减为单胎较未减胎的双胎者比较，妊娠结局明显改善。
And the embryos number before MPR also significantly impacted the pregnancy outcomes.
双胎减为单胎较未减胎的双胎者比较，妊娠结局明显改善。
And the embryos number before MPR also significantly impacted the pregnancy outcomes.
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