Abnormal arm posture or movements in a neonate may cause significant concern in a pediatric emergency department. This can be secondary to osteomyelitis, which may rarely present with asymmetric arm movements in the neonatal period. The diagnosis of osteomyelitis is difficult to establish in a neonate because systemic signs may not be present at this age. We report an infant with upper limb weakness and asymmetric movements 3 weeks after delivery.
