Background : Immunization against childhood diseases is one of the most important public health interventions against major childhood diseases . This effective intervention which has saved millions of lives of children  Materials and methods : A cross sectional study was conducted among 125 children of 12 to 23 months old  in the slum area under Urban Health Training Centre from October to December 2015 . Data analysis was done using SPSS 16.0 . A p value of < 0.05 was considered statistically significant .  Results : Out of 125 children , 76.8% were fully immunized and 23.2% partially immunized   . The most common  reason for partial immunization was fear of side effects. Partial immunization was significantly associated woth female gender and Muslim religion .  Conclusion : Continuous IEC activities to promote awareness on beneficial effects of immunization along with interpersonal communication is  necessary to improve immunization coverage .