Abstract
1. Three new cases of neonatal sciatic palsy are reported in twins. They received identical treatment after birth; in the case of the first two for identical difficulties occurring after delivery. In twins there is a greater liability to neonatal shock and so a greater incidence of umbilical injections.
2. The clinical evidence and the necropsy findings in Case 3 support the hypothesis that intra-arterial thrombosis is caused by the injection of an analeptic into the umbilical artery.
3. The clinical picture is described, with a discussion on the pathology, treatment and the reason for recovery in some cases.