Sixty seven infants were admitted over a 10-year period from 1972 to 1981: 50 males and 17 females. A higher incidence of hypertrophic pyloric stenosis exists in West Malaysia than was previously recognised. However, it remains at less than one tenth of the Western figures. Among the three major races, the condition was commonest in Indians and least in Malays. Most cases presented between the ages of 3 to 8 weeks. Prolonged history of vomiting of more than 3 weeks occurred in 43.3 percent cases, usually among Malay and Indian patients. All patients were treated surgically with 1 death (1.5 percent). The usual postoperative complication was vomiting which occurred in 22.4 percent. Early presentation, adequate preoperative resuscitation and improved anaesthetic techniques can further reduce this mortality and morbidity.