You have to start ROTAVIRUS vaccine before 3 month 14 days of age. For pneumonia no such age restrictions but 3 doses needed before 6 Month & if you start after 6 Month 2 dose plus 1 booster at 15 month.
Yes. They are quite important vaccines. Rota virus vaccine is to protect against severe diorrhoea caused by rotavirus. Depending on the brand cost is between 1000- 1500 per dose either 2- 3 doses. It's oral drops not injection.
Pneumococcal vaccine protects against pneumonia and brain fever and severe infections
cost depends on brand - 1600- 4000
hope this helps.
We should complete immunisation with the same vaccine type far as possible, but if its not available at next dose, switching the brand is ok. U can complete your baby's immunisation with either of the two vaccines you mentioned.