孕妇，27岁，G2P2孕41周，下腹坠胀伴阴道流水入院。早孕反应较重，孕50天时无诱因感畏寒、发热、咽痛及乏力等症状，血常规正常，拟诊为“病毒性上呼吸道感染”，未服任何药，一周后症状好转。孕8月产检发现胎失明显小于孕月，且与胎体发育不相称，B超检查胎头双顶径6.0cm，躯 Pregnant women, 27 years old, G2P2 pregnant 41 weeks, abdominal distension with vaginal fluid admission. Early pregnancy response heavier, pregnant 50 days no incentive to feel chills, fever, sore throat and fatigue and other symptoms, blood normal, to be diagnosed as “viral upper respiratory tract infection”, did not take any medicine, a week later, the symptoms improved. Pregnancy in August found that fetal loss was significantly less than the pregnancy test, and disproportionate with the carcass development, B-ultrasound fetal head biparietal diameter 6.0cm, body