The first conjugate pneumococcal vaccine (PCV-7), licensed in the year 2000 provides protection against 7 serotypes of pneumococcal bacteria.11 PCV-10 which was licensed a few years later provides protection against 3 additional serotypes. It has been proven that the types of bacteria which were not covered by the earlier pneumococcal vaccines are beginning to increase in Saudi.2 The use of PCV13 in National immunization schedule was started in 2012 and children between 2-5years didn't receive this vaccine, That is why a catchup dose with the PCV-13 vaccine is crucial to prevent pneumococcal disease in our community as it offers the broadest protection against pneumococci in the pediatric age group.