BACKGROUNDChild survival is dependent on many survival factors including immunisation. Even though, vaccines are provided free of cost at all government healthcare centers, the immunisation coverage in India is very low. Delayed vaccination not only increases the risk of vaccine preventable disease, but also increases the risk of never fully completing the vaccination course. The present study assessed the timeliness of immunisation for children below one year of age and factors influencing the timeliness of vaccination.