Background: The Majority (65.3 the respondents had been living in the ‘Katcha’ houses and none of them used to boil water, obtained from Water and Sewerage Authority WASA supply for drinking. Most (88.1) of the children defecated in the open field and almost all of the mothers (99.0) used to defecate in the hanging latrine. More than one-fourth (28.7) of the children had no habit of handwashing after defecation and the majority (69.3) of the mother's used only water for washing hands after defecation. About one-third of the children (32.7) had complaints of diarrhea with abdominal pain in the last 3 months with 44.5 having a history of the expulsion of any type of worm with stool during that time. Objective: The objective of the study was to determine the proportion of under-five children with a parasitic infestation about their mother’s infestation. Method: This descriptive study was conducted among mothers and their under-five children of Vashantek slum, Dhaka Cantonment, Dhaka from March 2003 to June 2003. Results: The prevalence of intestinal parasites was found to be 52.0 (48.5% in children and 55.4 in mothers). The prevalence of Protozoa was 13.2%, for children 15.8% and 10.9% in mothers. Helminthes infestations were found among 39.6% of children and 54.5% mothers. Of the 56 mothers with intestinal parasitic infestations, 66.1 of their children showed positive results. The relative risk of parasitic infestation was 2.478 times higher among the children of the mothers having a parasitic infestation. Of the respondents, 39.6 children and 20.8 mothers had a history of taking anti-helminthic drugs during the last six months. Conclusion: More than half of the study sample has intestinal parasitic infestation with a statistically significant relationship between the parasitic infestation of mothers and children.