患儿女,70 h,因“发现大腿皮肤瘀斑1天余”入院。患儿系第4胎第4产,孕35+6周,自然分娩,羊水Ⅲ度混浊,量中,脐带、胎盘正常,出生体重2 300 g。否认产伤、窒息史。生后38 h换尿布时发现右大腿约5 cm×7 cm瘀斑,生后42 h发现左大腿约3 cm×2 cm瘀斑,病程中无发热、气促,无呕吐、腹泻及血便,无尖叫,抽搐等。家族史:父母均35岁,农民,体健,否认家族中血栓及紫癜病史。患儿有1胞兄,8岁,体健;1胞姐,生后第2天双大 Children with children, 70 h, due to “found thigh skin ecchymosis more than 1 day ” admission. Children in the fourth child of the 4th birth, 35 weeks of pregnancy, 6 weeks, natural childbirth, amniotic fluid III turbidity, volume, umbilical cord, placental normal, birth weight 2 300 g. No birth injury, suffocation history. 38 h after birth diaper found about 5 cm × 7 cm ecchymosis of the right thigh, 42 h after birth found about 3 cm × 2 cm ecchymosis left thigh, no fever, shortness of breath, no vomiting, diarrhea and bloody stool, No screaming, convulsions and so on. Family history: Parents are 35 years old, peasants, healthy, deny the family history of thrombosis and purpura. Children have a brother, 8 years old, healthy; 1 Sister sister, born after the first two days