To assess safety and reactogenicity of GSK Biologicals' Haemophilus influenza type b vaccine co-administered with or without Chinese DTPw vaccine administered alone in healthy infants (3, 4 and 5 months of age)

All subjects will be randomized into two groups. One group will receive DTPw vaccine co-administered with Hib and another group will receive DTPw vaccine alone. A specific follow-up of solicited local and general symptoms after each vaccination. A specific follow-up of unsolicited symptoms after each vaccination. Recording of serious adverse events reported during the study period.

Inclusion Criteria:

• A male or female infant between, and including, 11 and 17 weeks of age at the time of the first vaccination.

Exclusion Criteria:

• Planned administration of a vaccine not foreseen by the study protocol during the period starting 30 days before the administration of the first vaccine dose and ending 30 days after the last dose.
• Chronic administration of immunosuppressants or other immune-modifying drugs from birth until administration of first dose of study vaccine.
• Use of any investigational or non-registered product (drug or vaccine) within 30 days preceding the first dose of study vaccine, or planned use during the study period.