Objective to observe the cardiac structures of the normal fetuses between 11 + 0 to 14 + 6 weeks' gestation for obtaining the normative data of the gestational age.
目的对妊娠11 + 0 ~14 +6周正常胎儿心脏结构进行观察，获得该孕周内正常胎儿心脏的生理参数。
Objective to observe the cardiac structures of the normal fetuses between 11 + 0 to 14 + 6 weeks' gestation for obtaining the normative data of the gestational age.
目的对妊娠11 + 0 ~14 +6周正常胎儿心脏结构进行观察，获得该孕周内正常胎儿心脏的生理参数。
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