Assess if Immune Response of GSK Biologicals' Tritanrix™-HepB/Hib-MenAC Given Without or With Hepatitis B Vaccine at Birth is at Least as Good as Tritanrix™-HepB/Hiberix™ Without Hepatitis B Vaccine at Birth, When Given to Healthy Infants

Inclusion criteria: * Healthy infants aged 3 days or less, written informed consent obtained from the parents, born after a gestation period of 36 to 42 weeks. * Result of the maternal blood sample (presence/not of hepatitis B virus) is available. Exclusion criteria: * Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination. * A family history of congenital or hereditary immunodeficiency. * Major congenital defects or serious chronic illness. * History of any neurologic disorders or seizures. * Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period (except for immunoglobulins given at birth to infants born to HBsAg seropositive mothers). * Acute disease at the time of enrolment. * Known exposure to diphtheria, tetanus, pertussis, hepatitis B, Haemophilus influenzae type b and/or meningococcal disease. * Hepatitis B vaccine given at birth outside the study.