 To compare three formulations of Hib-MenAC vaccines mixed with TritanrixTM-HepB vaccine with that of TritanrixTM-HepB vaccine concomitantly administered with GSK Biologicals HiberixTM vaccine and TritanrixTM-HepB vaccine mixed with HiberixTM vaccine and concomitantly administered with Wyeth Lederles meningococcal C conjugate vaccine MeningitecTM, with respect to antibody response to vaccine antigens meningococcal serogroups A and C and PRP after a three-dose primary vaccination course. 