Oct 5, 2021 · 0.5 mL, IM, once. Usual Pediatric Dose for Pneumococcal Disease Prophylaxis: 6 weeks to 5 years: 4 doses: 0.5 mL, IM, at 2 months, 4 months, 6 months, and 12 to 15 months Unvaccinated Children 7 months through 5 years:-Aged 7 to 11 months at first dose: a total of three 0.5 mL doses, IM--Give the first 2 doses at least 4 weeks apart.