Safety and Immunogenicity Study of GlaxoSmithKline (GSK) Biologicals' 10-valent Pneumococcal Conjugate Vaccine.

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 preceding the first dose of study vaccine, or planned use during the study period. * Planned administration/ administration of a 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.