Study to Show Non-inferiority of Tritanrix™-HepB/Hib-MenAC (+/- Hepatitis B Vaccine at Birth) Versus Tritanrix™-HepB/Hiberix™ Without Hepatitis B Vacc. at Birth for Antibody Response to All Vaccine Antigens Given in Healthy Infants

The purpose of this study is to compare the immune response, safety and reactogenicity of Tritanrix™-HepB/Hib-MenAC vaccine given either with or without a birth dose of hepatitis B vaccine to Tritanrix™-HepB/Hiberix™ when given to healthy infants (born to mothers who do not carry hepatitis B virus) at 6, 10 & 14 weeks of age. This study will also include a small group of infants born to mothers who do carry hepatitis B virus; these infants will receive a birth dose of hepatitis B vaccine and will be vaccinated with Tritanrix™ HepB/Hib-MenAC at 6, 10 & 14 weeks age.