Measles in children 2-5 months of age is a new phenomena not only in Equatorial Juba but in the Sudan at large. It is the first time a baby of two months of age and his mother who had never contracted measles till the age of 17 years have been admitted to Sabah Children's Hospital in Juba. This occurrence may indicate as in other areas where immunisation programmes have been carried out increasing numbers of people will not encounter measles till they reach adolescence or adult life. This could lead to infants being born without usually transmitted antibodies, hence develop infection with measles at an earlier age than has been usual in the past.