1例56 d男婴因血小板减少性紫癜入院。入院前2 d其母行输卵管结扎手术,术后口服阿莫西林预防感染,服药期间未停止哺乳。服药第2天晚患儿下肢皮肤出现散在针尖大小红点,第3天左下肢出现瘀斑。入院时血小板4×109/L,经骨髓细胞学检查,确诊为血小板减少性紫癜。停止哺乳,予以支持治疗,2周后患儿治愈出院。 A 56-year-old boy was admitted to hospital for thrombocytopenic purpura. 2 d before admission to its parent line tubal ligation, postoperative oral amoxicillin to prevent infection, did not stop breast-feeding during the medication. On the second day after taking the medicine, the size of scattered needle-tip red dot appeared on the skin of the lower extremities. On the third day, ecchymosis appeared on the lower limbs. Admission of platelets 4 × 109 / L, by bone marrow cytology, diagnosed as thrombocytopenic purpura. Stop breastfeeding, to support the treatment, 2 weeks after the children were cured.