Rotavirus (RV) is the most important cause of acute gastroenteritis (GE) requiring the hospitalization of infants and young children in developed and developing countries and can be a frequent cause of death in children less than 5 years of age (estimated nearly 500,000 annual deaths worldwide). GlaxoSmithKline (GSK) Biologicals has developed a vaccine against human rotavirus gastroenteritis. A new formulation of the vaccine, with an alternative buffer, was developed. This study will be conducted to evaluate the new formulation compared to the existing formulation of the HRV vaccine.