Bruising rarely presents in infants younger than 9 months who are not ambulatory and is more prevalent among children beginning to walk, or “cruisers.” We present the case of a healthy 3‐month‐old infant with asymptomatic, symmetric, bilateral, large bruises on the bony chest sparing the mid‐chest/sternum with a negative non‐accidental trauma work‐up. The noted pattern of bruises matched the bilateral shoulder straps of a 5‐point harness of the car seat belt designed for infants. Awareness of this unique pattern of bruises will help elicit a better‐informed history to guide care in an appropriate setting.

中文翻译：

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5 点式汽车座椅安全带导致胸壁瘀伤，模仿虐待儿童行为

9 个月以下不能行走的婴儿很少出现瘀伤，而在开始走路或“漫步”的儿童中更为常见。我们介绍了一名健康 3 个月大婴儿的病例，其骨性胸部有无症状、对称、双侧大瘀伤，但胸部中部/胸骨未受损伤，非意外创伤检查结果为阴性。所注意到的瘀伤图案与专为婴儿设计的汽车安全带 5 点式安全带的双边肩带相匹配。了解这种独特的瘀伤模式将有助于了解更丰富的病史，以指导在适当的环境中进行护理。