多胎妊娠，指一次妊娠同时有两个或两个以上胎儿，以双胞胎多见，三胎、四胎少见。要使多胎妊娠胎儿顺利诞生，一定要注意过好以下“三关”： 妊娠关 　　妊娠反应：多胎妊娠反应较单胎妊娠重，孕妇有剧烈恶心、呕吐、流涎等反应，甚至出现脱水、酸中毒症状。此时应鼓励孕妇 Multiple pregnancy, referring to a pregnancy at the same time there are two or more fetuses, more common in twins, three infants, four infants rare. To make the successful birth of multiple pregnancy fetus, we must pay attention to the following “three off”: pregnancy off pregnancy response: multiple pregnancy response than singleton pregnancy, pregnant women have severe nausea, vomiting, salivation and other reactions, and even dehydration, acidosis symptom. Pregnant women should be encouraged at this time