This study will evaluate the safety and reactogenicity of GSK Biologicals' Diphtheria Tetanus acellular Pertussis/Haemophilus influenzae type b vaccine given to Chinese infants at 3, 4 and 5 months of age.

Inclusion Criteria:

• A male or female between, and including, 90 and 120 days of age at the time of the first vaccination Written informed consent obtained from the parent or guardian of the subject

Exclusion Criteria:

• subjects with known exposure to diphtheria, tetanus, pertussis and/or Haemophilus influenzae disease can not participate, subjects who have received previous vaccination against diphtheria, tetanus, acellular pertussis and/or Haemophilus influenzae type b (Hib) diseases can not participate.

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.