This randomised outcome assessor , blinded controlled trial will recruit @ infants between @ and @days of age and randomly allocate them ( @:@:@ ) to one of three pneumococcal conjugate vaccine ( PCV ) schedules : Synflorix at @ , @ , @months of age , Prevenar@ at @ , @ and @months of age , or an investigational schedule of Synflorix at @ , @ and @months plus Prevenar@ at @months of age .