Infants, starting at 2 months old, should start receiving the pneumonia vaccine, according to the Centers for Disease Control. It is best for infants to get the shot in a series of four doses at ages 2 months, 4 months, 6 months and between 12 and 15 months.
Healthy children over the age of 2, but younger than 4, should get one dose of the pneumonia vaccine, explains the Centers for Disease Control. A child between the ages of 2 and 4 who has certain conditions, such as sickle cell disease, should get one or two doses if he has not received the four dose series as an infant. It is best to talk to a doctor about what dosage is right.