Formerly the policy of masterly inactivity was generally accepted in obstetrical practice. However, this is no longer true at the beginning of the present decade, and the authors are to be congratulated in trying to stimulate their juniors to approach the problems of Pre-natal Paediatrics in a well informed manner. Whilst inactivity may still be the treatment of choice in certain cases, it should only be carried out with the full knowledge that all is well, and this obviously will involve the use and understanding of new investigations and techniques. In my opinion the authors have achieved...