A retrospective study had been done at the outpatient clinic sub division of Pediatric Gastroenterology, Dr. Pirngcdi Hospital Medan, comprising patients from 1 January 1985-31 December 1987. There were 874 patients. Three hundred seventy eight (43.25%) patients consisting of 210 (55.56%) males and 168 (44.44%) females had intestinal parasitic infestations. The youngest patient was 5 months and the oldest was 14 years and 3 months. Ascaris lumbricoides was found in 215 patients (24.60%) while Trichuris trichiura, hookworm, Oxyuris vermicularis, Hymenolepis nana, and Taenia were in 152 (17.39%), 13 (1.49%), 4 (0.46%), 15 (1.72%) and 4 (0.46%) cases respectively. Entamoeba histolytica was found in 121 (13.84%) and Giardia lamblia in 16 (1.83%) patients. The highest age specific attack rate was found in the age group of 5-10 years (65.67%). Ascaris lumbricoides was most frequently found namely in 100 children (26.46%), followed by Entameba histolytica in 73 (19.31%) and mixed infestation of Ascaris lumbricoides and Trichuris trichiura in 68 (17.99%) patients. One hundred seventy three (66.28%) under five patients with intestinal parasitic infestation had malnutrition while of the 433 under fives without intestinal parasitic infestation only 201 (46.42%) suffered from malnutrition (P less than 0.001).