Conservative functional methods that have been applied to treat developmental dysplasia, should not used after the age of six months, mainly because the size and strength of the child do not allow the lower extremities to be held efficiently in the preferred positions. At this older age, it is believed that the optimum period of cartilage remodelling has passed, and closed reduction and/or surgical procedures are recommended.There is general agreement that the best results are achieved if the treatment of developmental dysplasia of the hip is initiated during the neonatal period. Patients in whom previous treatment of the disease has failed, those in whom the disease has been neglected, and those in whom the disease presented late are thought to be too old for management with functional methods. The conservative functional Papadimitriou method achieves a safe and lasting favourable outcome with a low prevalence of osteonecrosis and residual acetabular dysplasia even in these cases where the operation is the only treatment option. At present booklet techniques, guidelines and tips are presented so the paediatric orthopaedic surgeon can apply the method safely and successfully by quick referral to the booklet.