A Lot-to-lot Consistency (3 Lots of GSK Biologicals' 10-valent Pneumococcal Conjugate Vaccine) & Non-inferiority Study

Inclusion criteria: * Male or female between, and including, 6 and 12 weeks (42-90 days) of age at the time of the first vaccination, free of obvious health problems and with written informed consent obtained from the parent/guardian of the subject. Exclusion criteria: * Use of any investigational or non-registered drug or vaccine other than the study vaccine within 30 days preceeding the first dose of study vaccine, or planned use during the study period. * Planned administration/ administration of a licensed vaccine not foreseen by the study protocol during the period starting from one month before the first dose of vaccine(s) and during the entire study period.