患儿,男,30小时,因发现二下肢紫肿6小时入院。患儿系第4胎第2产,足月顺产,新法接生,无产伤窒息,生后24小时发现二下肢发紫、肿胀而来院收住。其父母非近亲结婚。查:体温37.5℃,呼吸36次/分,脉搏120次/分,营养发育佳,心、肺、腹无异常,脐带未脱落,无渗血,二侧膝关节以下全部发紫,左侧大腿内侧亦有大片状不规则形皮下紫斑,边界清楚,局部压痛,肿胀明显,无发硬,无灼热感,无波动感,触二 Children, male, 30 hours, because of the discovery of two lower extremities swollen 6 hours admitted. The second fetus of children with the fourth birth, full-term natural delivery, the new law delivery, no births asphyxia, 24 hours after birth found two lower limbs purple, swelling and hospital admission. Their parents marry non-relatives. Check: body temperature 37.5 ℃, breathing 36 beats / min, pulse 120 beats / min, good nutrition and development, heart, lungs, abdomen no abnormalities, umbilical cord did not fall off, no bleeding, bilateral knees below all purple, left thigh There are also large irregular patchy inside the purple, clear boundaries, local tenderness, obvious swelling, no hard hair, no burning sensation, no sense of volatility, touch two