Non-inferiority of GSK Biologicals' DTPw-HBV/Hib Compared to Two Formulations of GSK Biologicals' DTPw-HBV/Hib

Inclusion Criteria: * Subjects who the investigator believes that their parents/guardians can and will comply with the requirements of the protocol should be enrolled in the study. * A male or female between, and including, 6 and 8 weeks of age at the time of the first vaccination. * Written informed consent obtained from the parent or guardian of the subject. * Healthy subjects as established by medical history and clinical examination before entering into the study. * Born after a gestation period of 36 to 42 weeks inclusive. * Administration of one dose of hepatitis B vaccine at birth Exclusion Criteria: * Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the first dose of study vaccine, or planned use during the study period with the exception of OPV. * Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying drugs since birth. * Planned administration/ administration of a vaccine not foreseen by the study protocol during the period starting 30 days before the administration of the first vaccine dose, (with the exception of OPV). * Bacille Calmette-Guérin (BCG) vaccine received after the first 2 weeks of life. * Hepatitis B vaccine received after the first week of life. * Previous vaccination against diphtheria, tetanus, pertussis, Haemophilus influenzae or hepatitis B (except hepatitis B at birth). * History of diphtheria, tetanus, pertussis, Haem…