Infants in the consistent limb group received the diphtheria-tetanus-acellular pertussis-inactived polio-Haemophilus influenzae type b combined vaccine ( DTaP-IPV-Hib ) at 2 , 3 , and 4 months of age , and the pneumococcal conjugate vaccine ( PCV13 ) at 2 , 4 , and 12 months , all administered to the right leg .