Co-administration Study of an Investigational Live-Attenuated Respiratory Syncytial Virus Vaccine in Infants and Toddlers

The study duration is approximately 9 months for each participant. * Cohort 1: Visits at 6, 7, and 8 and 9 months of age for both groups with visit at 10 months of age for Group 2 only * Cohort 2: Visits at 12, 13, 14 and 15 months of age for both groups with visit at 16 months of age for Group 4 only * Routine pediatric vaccines (authorized auxiliary medicinal products (AxMP) will be administered at 6 months in Cohort 1 and 12 months of age in Cohort 2, as per Advisory Committee on Immunization Practice (ACIP) or local country recommendations.