Summary Selective induction of labour was carried out in 241 Rh‐immunized patients. The past obstetrical history, the indirect antiglobulin titre, and the colour of the liquor amnii were all considered before the time of induction was determined. In pregnancies in which antibodies first appear and in any pregnancy subsequent to one in which the baby was only mildly affected by erythroblastosis (Group I), the indirect antiglobulin titre was used as the chief indication, and the colour of the liquor as a secondary indication, of when to induce labour. Labour was usually induced between 40 and 35 weeks. In 183 patients in this category with Rh positive babies there was a peri‐natal mortality of 8 per cent. In cases where a previous pregnancy had resulted in a baby requiring an exchange transfusion (Group II), the colour of the liquor was used as the chief indication of when to induce labour. In general, labour was induced between 37 and 35 weeks. In 64 pregnancies in this category with Rh positive babies there was a peri‐natal mortality of 17 per cent. In cases where a previous pregnancy had resulted in a baby dying from erythroblastosis (Group III), induction of labour should be carried out a week before the stage at which the previous foetal death occurred (providing the pregnancy has passed the 33rd week), or according to the colour of the liquor or the strength of the foetal movements. In this group labour was usually induced between 37 and 34 weeks, and in 46 pregnancies where the baby was Rh positive there was a perinatal mortality of 54 per cent. It is obvious that many factors must be considered before the time of induction is finalized. Each patient must be considered individually and such complications as preeclampsia and hydramnios may further alter the time of induction. Surgical induction of labour, with the use of intravenous oxytocic agents where necessary, is an effective method of initiating labour. Such a regime was used in 233 patients with a 2 per cent failure rate. The Rh status of the foetus was forecast after a consideration of the genotype of the father, the past obstetrical history and a study of the liquor amnii.