I wish to thank the physiotherapy staff at the Wilfrid Sheldon Child Development Centre, especially Rowenna Hughes, Inge Gregorius and Helen Farmer, for their encouragement and assistance in the development of this material. Thanks go also to Jane Macer, Irene Sclare, Caroline Griffiths and David Crombie for their contributions and to Jonathon Evans and Gail Thurley for the illustrations.