Study to Evaluate a 13-valent Pneumococcal Conjugate Vaccine in Infants

Single 0.5 mL dose given at 2, 3, 4, and 12 months of age

Single 0.5 mL dose given at 2, 3, 4 and 12 months of age

concommitant vaccine, both at arm 1 and at arm 2, at 2 months, 3 months and 4 months of age

concomittant vaccine, both at arm 1 and at arm 2, at 2 months and 4 months of age

concomitant vaccine, both at arm 1 and at arm 2, at 12 months of age