Five parallel treatment groups receiving a 3-dose primary vaccination course: MenC-TT vaccine (2 formulations, double-blind) + Infanrix hexa® OR Hib-MenC-TT (2 formulations double-blind) + Infanrix penta® OR Meningitec™ + Infanrix hexa® (control). Three blood samples taken, before dose 1 and one month after dose 2 and dose 3.