http://en.wikipedia.org/wiki/Pneumococcal_conjugate_vaccine#United_StatesUnited States
In 2001, the Centers for Disease Control (CDC), upon advice from its Advisory Committee on Immunization Practices, recommended the vaccine be administered to every infant and young child in the US. The resulting demand outstripped production, creating shortages not resolved until 2004. All children, according to current US vaccination schedules, should receive four doses, at two months, four months, six months, and again between one year and fifteen months of age.