The objectives of the study were to assess the immunization status among under five children and to assess factors for partial or non immunization among under five children in selected community of New Delhi. Sample comprised of 100 mothers having 142 under five children. A purposive sampling technique was employed to select the sample from the population. A descriptive survey design was adopted for the study. A structured interview schedule was designed to collect the data. Maximum 46% of the mothers were in the age group of 26­30 yrs, 26% mothers were illiterate and 78% were Hindu. Out of children, 55%were male and 45% were female. It was found that 81% of the children were partially immunized whereas only 9% were fully immunized and 10 % were not immunized at all. Fisher’s exact test showed a significant association between religion as well as educational status of mother and immunization status and Chi square test showed significant association between sex of children and immunization status. There were many factors responsible for non/partial immunization. The maximum problem was due to parents going to home town, and busy with their work/no holidays, mothers found difficulty to go alone and had no body to accompany them. They also had a myth that child become sick after vaccination. The information for the next immunization was also lacking. 

Keywords: Fully Immunized; Partially Immunized; Non Immunized; Under Five.