Research Question: To find out if there is delay in immunisation of infants and determine the factors influencing the vaccination Settings: Urban Health Centre in Mumbai. Study Design: Cross-sectional observational type of study Participants: 93 infants at the immunisation OPD. Methodology: Mothers with infants attending the immunisation OPD at the urban health centre in a period of one month were interviewed using a structured questionnaire after the child received the vaccination for the day. Results: The immunisation status of 57 (61.3%) boys and 36 (38.7%) girls was assessed. Majority of the infants were more than 44 days (78). Timely (within 7 days of birth) BCG vaccination was received by 83% of the infants. Amongst the 16 infants with delayed BCG immunisation, a delay of more than one month was observed in 6 infants. The delay in BCG vaccination was significantly associated with sex of child and mothers education status. Delay by more than a week for first, second and third dose of oral polio vaccine, trivalent vaccine of diphtheria, pertusis and tetanus, and hepatitis B vaccine was observed in 25%, 25% and 34% respectively. Measles vaccination was delayed in 60% of the infants who were of eligible age.