Welcome to HCM,
Pnumococcal prevents from Streptococcus pneumoniae
bacteria.This bacteria causes not only pneumonia but also meningitis
and Otitis media(middle ear infection
).Although this is relatively newer vaccine
but now a days it is getting popularity for its good prevented function.
And now the vaccine schedule of the vaccine for your unvaccinated baby-
1.Single dose at a time (no booster dose is needed)
So go for a single dose and get protected.
I hope the advice will help you.