Immune Response Post Pry Vaccination of 2 Formulations of DTPw-HBV Vaccine Given With Rotavirus Vaccine to Infants

Inclusion criteria: * Subjects who the investigator believes that their parent/guardian can and will comply with the requirements of the protocol. * Administration of one dose of hepatitis B vaccine at birth. * A male or female between, and including, 11 and 17 weeks of age at the time of the first DTPw vaccination. * Free of obvious health problems as established by medical history and clinical examination before entering into the study. Exclusion criteria: * Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine(s) within 30 days preceding the first dose of study vaccine, or planned use during the study period. * Chronic administration of immunosuppressants or other immune-modifying drugs since birth. * Planned administration/ administration of a vaccine not foreseen by the study protocol within 30 days before the first vaccine dose or planned administration during the study period with the exception of oral polio vaccine. * Any confirmed or suspected immunosuppressive or immunodeficient condition based on medical history and physical examination (no laboratory testing is required) * Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period.