The purpose of this study is to assess the safety, tolerability and immunogenicity of a 13-valent pneumococcal conjugate (13vPnC) vaccine compared to 7-valent pneumococcal conjugate (Prevenar/Prevenar®, 7vPnC), when given concomitantly with Infanrix hexa at 2, 3, 4, months (infant series) and at 11-12 months of age (toddler dose) in Germany.