患儿，男，25天，主因皮肤紫瘢5天于93年12月25日入院。系第一胎，足月顺产，母孕期体健。生后母乳喂养。近一周来因母亲患急性乳腺炎而改用全脂奶粉喂养。5天来发现患儿双下肢出现对称性紫瘢，并逐渐增多，波及双臂部，未见其他部位出血，无热，不吐，不泻，吃奶好。病前母婴 Children, male, 25 days, mainly due to skin purple scar 5 days in December 25, 1993 admission. Department of the first child, term full-term, pregnant during pregnancy. After birth breastfeeding. Nearly a week because the mother suffering from acute mastitis instead of full-fat milk feeding. 5 days to find symmetrical purple scar in both lower limbs in children, and gradually increased, affecting the arm, no other parts of the bleeding, no heat, no spit, no diarrhea, good feeding. Pre-sick mother and child