患者女，３０岁。孕１产０。平素月经规律，１５日天，末次月经１９９６年５月１８日，预产期１９９７年２月２５日，停经后４０＋日出现恶心、呕吐等早孕反应，孕４＋月开始自觉有胎动。产前检查血压、胎位无异常，孕期曾多次在外院行Ｂ超检查示胎儿无异常。整个妊娠过程顺利 Female patient, 30 years old. Pregnancy 1 production 0. Normal menstrual regularity, 15 days, the last menstrual period May 18, 1996, the expected date of February 25, 1997, 40+ days after menopause nausea, vomiting and other early pregnancy reactions, pregnancy 4 + months began to consciously have fetal movement. Prenatal examination of blood pressure, fetal position no abnormalities, multiple pregnancy during the B-ultrasound showed that the fetus was normal. The whole pregnancy goes well