Larsen's syndrome is characterised by multiple joint dislocations, flat face and talipes equinovarus. There is an autosomal dominant form and also a more severe autosomal recessive form. Several types of polycystic kidney disease have been reported in children. In this report we present an infant with a severe form of Larsen's syndrome (thought to be lethal Larsen-like), infantile-type polycystic kidney disease, biliary dysgenesis and osteosclerosis.