1. Epidemiology of wheezing in infants and preschool children -- 2. Respiratory syncytial virus (RSV) infection and wheezing -- 3. Immunology of wheezing disorders in infants and preschool children -- 4. Clinical features of the wheezy infant -- 5. Lung function in the wheezy infant and preschool child -- 6. The wheezy infant and preschool child : differential diagnosis -- 7. Management of wheezing in infants and preschool children -- 8. Proposals for the future.