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Only one of the vaccines, PCV13, is considered safe for children under the age of 2, This vaccine is important because infants and very young children are at higher risk for several dangerous infections, including pneumonia and bacterial meningitis.
The childhood vaccine (PCV) protects against 13 strains of the pneumococcal bacterium, while the adult vaccine (PPV) protects against 23 strains. The pneumococcal vaccine is thought to be around 50 to 70% effective at preventing pneumococcal disease. Read about how the pneumococcal vaccine works.