The first dose of the thirteen-valent pneumonia vaccine should not be given later than one year of age if possible, because the thirteen-valent pneumonia vaccine is a full four-dose course that needs to be completed within two weeks of age. The thirteen-valent pneumonia vaccine is suitable for infants and children within two weeks of age, and usually one dose is given at the age of 2, 4 and 6 months respectively, which is the basic immunization program. A booster dose is given at 10 to 15 months of age to consolidate the immunization effect. If the first dose is given after 1 year of age, it may not be possible to complete the basic immunization program and booster vaccination within 2 years of age. Therefore, it is recommended that the first dose of 13-valent Pneumovax vaccine be given no later than 1 year of age. Since pneumonia is more common in infants and young children, vaccination should be given as early as possible, but too late to achieve the optimal benefit of vaccination. Consult your doctor for advice before making a judgment.